Version 3.24
    o Fixed: bug printing row numbers for very large solutions
      (thanks to Andreas Corcaci for the report)
    o Fixed: C level bug finding models against a too high coverage
      (thanks to Michael Baumgartner for the report)
    o Improved: C level minimizaton code now uses bit-shifting
    o Improved: more functions (e.g. superSubset) are now running parallel
      code so theoretically they should be faster when using OpenMP
    o Improved: solving a PI chart using Gurobi does not require the R
      package gurobi, anymore (it only needs Gurobi installed)
    o New: argument "type" in findmin() allowing to chose between the
      "exact" solving (the default) and the quicker heuristic using
      Lagrangian relaxation

Version 3.23
    o New: academic users having a valid (free) Gurobi license can now
      use the Gurobi optimizer for the fastest solving of the PI chart
    o New: multi-value outcome can be negated with a tilde in function
      truthTable()
    o Fixed: bug affecting minimize() using a truth table and excluding
      untenable configurations (thanks to Ian Greener for the report)
    o Fixed: bug affecting findRows() when the outcome was defined as
      an object containing the name of the column of interest
      (thanks to Philipp Sekol and Ian Greener for the report)
    o Fixed: bug affecting selection of PIs based on consistency level
      (thanks to Sophie Delede for the report)
    o Fixed: bug displaying inclusion for necessity instead of sufficiency
      for the minimization object, when condition names contain a minus sign
      (thanks to Philipp Sekol for the report)

Version 3.22
    o New: package "declared" is now imported by default
    o New: argument "select" in function modelFit(), to allow selecting models
      in situations with high model ambiguity (thanks to William Hopkinson for
      the suggestion)
    o Fixed: printing bug when truth tables have more than 7 explanatory
      conditions (thanks to Georgios Fotopoulos for the report)
    o Fixed: bugs in fuzzyand() and fuzzyor() when the inputs are more complex
      vectors of values (thanks to Ian Greener for the report)
    o Changed: argument "obj" is now the first formal in function findRows()

Version 3.21
    o Fixed: printing bug when employing labels
    o Fixed: error related to single condition data, in function pof()
    o Reverted to depending on package lpSolve, due to too many CRAN warnings
      for the C level code

Version 3.20
    o Changed: argument "categorical" renamed to "use.labels", globally
    o New: function minimize() gains its own formal argument "use.labels"
    o Improved: detection of multi-value notation
    o Fixed: bug in superSubset() for multi-value outcomes
    o Fixed: side-effect bug affecting truth tables with more than 7
      conditions, when n.cut > 1 (thanks to Pedro Carmona for the report)

Version 3.19
    o Changed: internal functions setColnames() and setRownames() moved to
      package admisc
    o Fixed: bug affecting the printing of row names in function truthTable(),
      when n.cut is greater than 1 (thanks to Carsten Schneider for reporting)

Version 3.18
    o Improved: an error is issued if multivalue conditions do not strictly
      follow the sequence 0, 1, 2, ...
    o Improved: C level fine tuning to silence CRAN warnings about lpSolve
      (thanks to Gábor Csárdi)

Version 3.17
    o Improved: import options in the GUI, allowing to check for BOM on Windows
    o Removed: formal argument "min.pin" (but still backwards compatible) from
      function minimize()
    o Fixed: bug in modelFit() dealing with multi-value theory expressions
      (thanks to Mashal Shabbir for the report)

Version 3.16
    o Fine tuned C code to avoid compilation problems in GCC

Version 3.15
    o Improved: argument "exclude" now accept SOP expressions
    o Improved: function truthTable() now accept formal arguments from function
      findRows(), when excluding configurations
    o Fixed: printing bug in causalChain() for individual components
      (thanks to Omar Bautista González for the reports)

Version 3.14
    o New: argument "categorical" in functions truthTable(), superSubset(),
      pof() and pofind(), introducing categorical causal conditions
    o Improved: functions minimize() and findRows() to work with interactive
      shiny applications (thanks to Ian Greener for the suggestion)
    o Fixed: bug in modelFit() when the outcome is specified as negated
      (thanks to Marco Meier for the report)
    o Fixed: bug in truthTable() not properly dealing with complex
      configurational outcomes

Version 3.13
    o Fixed: bug in truthTable() excluding inconsistent configurations when
      activating the "complete = TRUE" argument
      (thanks to Nicolai Schulz for the report)

Version 3.12
    o Arguments pi.cons and sol.cons are re-introduced as formals in function
      minimize(), and they remain formal arguments in function causalChain()
      as well, making it possible to filter PIs and solutions by consistency
      (thanks to Carsten Schneider for the suggestion)
    o Configurational outcomes are now possible
    o Function getName() moved to package admisc

Version 3.11
    o Improved: error trapping in function pof()
    o Fixed: occasional (but non-disruptive) R level error messages, likely
      related to the C communication (thanks to Ian Greener for the report)
    o Arguments "pi.cons", "pi.depth", "sol.cons", "sol.cov", and "sol.depth"
      moved from function minimize() to function causalChain()

Version 3.10
    o Major rewrite of the core C code, to prevent any possible memory leaks
      and segmentation faults
    o New: argument "max.comb" in function minimize(), to limit the size of the
      PI chart to the number of PIs at that complexity level where the possible
      number of combinations does not exceed a maximum value
    o New: argument "first.min" in function minimize(), to return the very first
      minimal model found, provided the PI chart can be solved
    o Changed: argument "min.pin" no longer cares if the PIs at the next
      level of complexity contribute or not to the number of minimal models;
      instead, it strictly returns the PIs at the first level of complexity
      where the PI chart can be minimally solved
    o New: arguments "max.comb" and "first.min" in function solveChart(), to
      mirror those from function minimize()

Version 3.9
    o Function export() moved to package admisc
    o Fixed: row numbers bigger than the total number of rows in a truth
      table are now ignored from the "exclude" argument
      (thanks to Philipp Bentz for the report)
    o Fixed: minor bug displaying additional parameters of fit in function pof()
    o Changed: function minimize() no longer returns with an error when
      including remainders on saturated truth tables
      (thanks to Michael Baumgartner for the suggestion)
    o Fixed: minor bug in when dealing with a single column PI chart
      (thanks to Michael Baumgartner and Martyna Swiatczak for the report)

Version 3.8
    o New: package QCA now accepts unquoted strings for SOP expressions,
      as well as to specify the outcome and conditions, in functions:
      findRows(), generate(), makeChart(), minimize(), modelFit(), pof(),
      pofind(), superSubset(), truthTable() and XYplot()
    o New: implemented a custom version of lpSolve to find exact disjunctive
      solutions for very large and sparse PI charts
    o Fixed: bug in XYplot() when using a vector produced by fuzzyor()
      (thanks to Ian Greener for the report)
    o Fixed: bug affecting the case names in the parameters of fit when
      excluding remainders (thanks to Ian Greener for the report)
    o Fixed: bug leading to a C error when simplifying assumptions do not exist
      for some intermediate models (thanks to Oliver Klein for the report)
    o Changed: function minimize() now gives an error when including remainders
      but all possible configurations are observed
    o Changed: reverted back to using the easy counterfactuals method for the
      intermediate solution, since it is not always possible to restrict it
      to a single model (thanks to Max Netherworlds for the example)
    o Changed: notation for multi-value conditions now uses square brackets
      instead of curly brackets, but the later are still recognised
    o Changed: the sufficiency and necessity relations are now denoted using
      the simpler notation -> and <- instead of => and <=

Version 3.7
    o New: useful functions added to the companion package admisc, among which
      one called invert() that changes a SOP to a POS expression and back
      (thanks to Charles Ragin for the suggestion)
    o New: function generate() for the corresponding data of an arbitrary data
      generating structure (DGS), supplied as a SOP expression
    o Changed: major modification (and *not* backwards compatible) relative to
      denoting negations. Using upper and lower case letters for presence and
      absence is no longer supported, a tilde being the only and the default
      method to signal a negation (thanks to Charles Ragin for making the point)
    o Changed: argument "all.sol" no longer deactivates argument "min.pin", as
      they can be combined to find all PIs that minimally solve the PI chart,
      but not all PIs. The "min.pin" argument without "all.sol" will find only
      the simpler PIs that minimally solve the chart, with increased speed.
    o Changed: removed deprecated argument "use.tilde" from all functions
    o Changed: minimization output now always uses a star sign "*" to denote a
      conjunction, even when the conditions are single letters
    o Changed: argument "exclude" was moved from function minimize() to function
      truthTable()
    o Changed: all printing classes to avoid possible namespace collision with
      package admisc, where a number of functions were moved
    o Changed: printing minimization objects no longer display the truth table
      but only the parameters of fit, when argument "details" is activated
      (thanks to Christian Rupietta for the suggestion)
    o Changed: dialogs for truth table and minimization in the GUI, to reflect
      the current changes
    o Improved: new method of deriving the intermediate solution, without
      using any counterfactuals. This restricts the intermediate solution
      to only one model for each combination of conservative and parsimonious
      models
    o Improved: error messages for function calibrate()
      (thanks to Karen Elliott for the suggestion)
    o Improved: function findRows() now also work with negated truth tables
      (thanks to Ian Greener for the suggestion)
    o Fixed: segmentation fault for extremely complex PI charts
      (thanks to Albert Chiu and Yiqing Xu for the report)

Version 3.6
    o Solved bug related to starting the Graphical User Interface, which
      failed to load the required package admisc
    o Functions compute(), factorize(), intersection(), negate()
      and simplify() moved to package admisc, with no visible effects on
      the users' side

Version 3.5
    o New: first implementation of conjunctural directional expectations
      (thanks to Carsten Schneider for insisting)
    o Improved: function simplify() now able to solve even further
      simplifications, using a method advanced by Quine
    o Improved: to avoid infinite running times for very complex PI charts,
      only the first exact solution is returned, with a warning message
      (thanks to Konan Seny Kan for the example)

Version 3.4
    o New: function findRows() gains a three dots argument "..." to allow
      passing a combination of cutoff values to function truthTable() for
      the negation of the outcome
    o New: function truthTable() gains a new argument called "pri.cut"
    o Improved: function superSubset() gives a better error message when
      no combinations are left given all cutoff values, including ron.cut and
      pri.cut (thanks to Carsten Schneider for the suggestions)
    o Improved: function simplify() now able to solve further simplifications
      such as A + ~AB into A + B (via A + AB + ~AB)
    o Improved: uniform QMC solutions from all minimization methods, with
      no negative configurations, and including remainders
    o Improved: function pofind() now accepts multivalue data
      (thanks to Hanieh Moshki for the suggestion)
    o Fixed: long overdue bug (dating from version 1.0-0) that incorrectly
      identified the easy counterfactuals for some directional expectations
      involving multiple values
    o Fixed: bug in printing the cases, when they contain multi-byte
      characters (thanks to Stefan Verweij for the report)
    o Changed: function sop() renamed to simplify()
    o Changed: all C level functions are now renamed using a "C_" prefix,
      to avoid a namespace overlap with the main R functions

Version 3.3
    o New: function calibrate() now accepts method = "TFR" to calibrate
      ordinal values using the Totally Fuzzy and Relative method
    o Improved: relation between Include and Exclude switches in the
      graphical user interface
    o Improved: the functions sop() and factorize() now try harder to
      simplify the result, where it can be simplified
      (thanks to Macartan Humphreys for the suggestion)
    o Fixed: minor bug leading to an error in truthTable() function,
      for data with a single truth table configuration
      (thanks to Ingo Rohlfing for the report)
    o Fixed: error in the GUI, when exporting a dataset
      (thanks to Ranajoy Choudhury for the report)
    o Changed: argument "tilde" in function factorize() renamed to
      "use.tilde", making it uniform accross functions
    o Changed: relaxed the error about the 0.5 values in the fuzzy data
      from the truthTable() function, to a warning
    o Updated: the latest versions of the jQuery and jQuery-UI in the
      graphical user interface

Version 3.2
    o New: dramatically improved function to solve the prime implicants
      chart (using Petrick's method), hundreds of times faster when
      searching for all solutions
    o New: function pofind(), to calculate quick parameters of fit for
      atomic conditions (thanks to Alessia Damonte for the suggestion)
    o Improved: the minimization object now prints only the unique
      intermediate solutions, adding all combinations of conservative and
      parsimonious solutions that produced each unique intermediate one
      (thanks to Karina Mross for the suggestion)
    o Improved: the function pof() no longer throws an error when the data
      object is a tibble instead of a native R data frame
    o Improved: function translate() now tries harder to throw an error
      message when the expression specifies conditions using both lower and
      upper case letters (e.g. "ConD" instead of "cond" or "COND")
    o Changed: argument "min.pin" in function minimize() is now inactive
      by default
    o Fixed: bug in compute() when the expression and the column names in
      the data simultaneously contain both lower and upper case letters
    o Fixed: bug in compute() when the the data contains character columns
      (for instance case names, thanks to Alessia Damonte for the report)
    o Fixed: bug in fuzzyand() when the the input is a result of a previous
      fuzzyand() function (thanks to Alessia Damonte for the report)
    o Fixed: bug in XYplot() that prevented calculating parameters of fit
      when the input is a vector of class "fuzzy" generated by fuzzyand()
      or fuzzyor() functions (thanks to Alessia Damonte for the report)
    o Fixed: bug in modelFit() that incorrectly assigned numbers to models

Version 3.1
    o New: spinning wheel in the web R console when calculations take a
      long time
    o Improved: faster version of getRow() that help speeding up finding the
      simplifying assumptions
    o Fixed: minor bug in the classical QMC algorithm when the PI chart has
      exactly one column, irrelevant PIs were reported as sufficient (thanks
      to Michael Baumgartner for the report)
    o Fixed: minimization in the classical QMC with exactly two observed
      configurations
    o Fixed: error in the truth table production when imposing a frequency
      cutoff over 1 (thanks to Verena Patock for reporting)
    o Fixed: error in fuzzy calibration, when thresholds are outside of the
      data range (thanks to Priscilla Alamos-Concha for the report)

Version 3.0
    o New: cutting edge, next generation algorithm for Boolean minimization
    o New: function causalChain() to enable coincidence analysis comparable
      with the version 2.0 of package cna
    o New: function modelFit() to enable theory evaluation
    o New: function findmin() to find the minimum number of PIs necessary to
      solve a PI chart, replacing the function lp() from package lpSolve
    o New: arguments "sol.cons" and "sol.cov" added to function minimize()
    o New: arguments "enhance" and "model" added to function XYplot()
    o New: reactivated the argument "add" to functions pof() and superSubset(),
      to allow for more parameter of fit measures in the output
    o Improved: function intersection() now accepts entire minimization objects
      of class "qca" as input
    o Improved: function minimize() gains three new arguments "depth", "min.pin"
      and "method"
    o Improved: function recode() gains two new arguments "cuts" and "values"
    o Improved: function truthTable() gains a new argument "dcc" to identify
      deviant cases consistency in kind
    o Improved: function calibrate() gains a new argument "method", implementing
      the indirect method along the traditional direct method of calibration
    o Improved: function XYplot() now accepts complex expressions for both x and y
    o Improved: when data is available, functions translate(), compute() and pof()
      throw an error if the data is multivalue and the expression is not
    o Improved: more negation signs (apart of the tilde) are accepted for all
      functions that have a character expression as input(s)
    o Improved: when printing the truth table, column "OUT" in now spaced out
      more evidently, to differentiate it from the other columns and create a
      natural separation between the configurations and the parameters of fit
    o Improved: better documentation, including the HTML version from the GUI
    o Improved: functions fuzzyand() and fuzzyor() gain two new arguments called
      "na.rm" (indicating to remove missing values) and "use.tilde", to signal
      negations when constructing attribute expressions
    o Improved: function findRows() now accepts a matrix in addition to a truth
      table, for demonstration purposes
    o Improved: function findRows() gains a new argument called "type", to find
      contradictory simplifying assumptions and simultaneous subset relations
    o Changed: objects of class "fctr" now have class "factorize"
    o Changed: objects of class "deMorgan" are now proper character vectors
      instead of lists containing these vectors
    o Changed: objects of class "pic" (prime implicants chart) and "translate"
      are now proper matrices instead of lists containing matrices
    o Changed: function makeChart() gained three new arguments: "mv",
      "use.tilde" and "collapse" for a complete flexibility, and its output
      gained the class "pic"
    o Changed: the argument "data" in function minimize() is renamed to "input"
      (but still backwards compatible)
    o Changed: argument "omit" from function minimize() renamed to "exclude"
    o Changed: simplified function minimize(), the following arguments are
      dropped but still backwards compatible: outcome, conditions, incl.cut,
      show.cases, n.cut, use.letters, inf.test as they were duplicating the same
      arguments from function truthTable(), to which they are sent anyways; in
      addition, arguments relation and explain did not have any real use
    o Changed: crisp calibration now include the thresholds values in the upper
      groups, to maintain backwards compatibility and be consistent with the
      default function findInterval() which now crisp calibration employs. Users
      who actually want to _exclude_ the thresholds from the upper groups, should
      simply set them to an upper value (thanks to Yan Turgeon for the report).
    o Changed: function deMorgan() renamed to negate()
    o Changed: function eqmcc() renamed to minimize()
    o Fixed: minor bug in the web GUI, the data editor did not display the
      correct cell value on double click, when scrolling horizontally
    o Fixed: bug in function minimize(), with all directional expectations as
      don't cares it should return the complex solution
      (thanks to Eva Thomann for the report)

Version 2.6
    o Improved: function superSubset() is now many orders of magnitude faster
    o New: argument "depth" added to functions superSubset() and allExpressions()
    o New: functions createMatrix() and allExpressions() are now able to produce
      all possible combinations up to certain length of conjunctions via "depth"
    o Fixed a couple of minor bugs in the web interface
    o New: arguments "ron.cut" and "pri.cut" added to function superSubset()
      (thanks to Carsten Schneider for the suggestion)
    o New: component "minmat" to the truth table object
      (thanks to Markus Siewert for the suggestion)
    o Changed: function plot1() renamed to Xplot()
    o Fixed: a couple of minor bugs in the user interface behavior
    o Fixed: a couple of minor bugs in functions translate() and deMorgan()
      when feeding multivalue conditions with multiple levels

Version 2.5
    o Packages QCA and QCAGUI merged back into a single package QCA.
    o New in GUI: redesigned dialog for the calibrate menu, which now contains
      a thresholds setter area for both crisp and fuzzy calibrations.
    o New: function sop() to transform any expression into a simpler (minimal)
      equivalent sum of products
    o New: the truth table object now contains an additional component with the
      matrix between cases and truth table rows
    o New: function plot1() to examine the distribution of values for a single
      causal condition (typically for calibration purposes)
    o Improved: SOP expressions now allow the negation of multivalue conditions,
      as well as unions of multiple levels for the same causal condition.
    o Improved: deMorgan() now allows negating multivalue expression, providing
      a new argument called "noflevels"
    o Improved: treatment of commands in the GUI console
    o Improved: for boolean expressions only (not multivalue), the function
      translate() now allows duplicated set names in the same product
    o Removed: argument "include" from function calibrate(): it only applied to
      the crisp calibration, and did not have any practical advantage, users
      could simply move the threshold one more (lower or upper) value.
    o Removed: argument "add" from function pof(), both PRI and RoN are now
      formally included in the output.
    o Removed: arguments "prod.split" and "complete" from function deMorgan().
    o Changed: argument "dep" in function retention(), to "dependent".
    o Changed: argument "row.no" in function findSubsets(), to "input".
    o Changed: argument "maximum" in function findSubsets(), to "stop".
    o Changed: argument "input.combs" in function findSupersets(), to "input".
    o Changed: argument "type" in function calibrate() is now "fuzzy" by default
    o Fixed: a situation when all directional expectations are "don't cares", and
      the intermediate solutions should be identical to the parsimonious solutions
      (thanks to Carsten Schneider for reporting)
    o Fixed: a bug giving an error for a non-calibrated original dataset, when
      the minimized object was already produced by truthTable()
      (thanks to Nena Oana and Carsten Schneider for the report)

Version 2.4
    o Improved: major rewrite of the GUI code to allow working with multiple
      datasets / objects in the same time
    o New: minimization in the user interface now allow input from both data and
      truth table objects
    o Changed: removed argument size from function XYplot()
      (due to compatibility with the web user interface)
    o Fixed: examples sections to allow building the sources for Mavericks
    o Fixed: server code to avoid duplicating commands in the GUI console
    o Fixed: plot window in the GUI did not reopen after close
    o Fixed: minor bug in the recode() function, affecting numeric conditions
      when using a range from lowest to a number, below the actual minimum

Version 2.3
    o New: the user interface gained the possibility to plot graphics from the
      command line
    o New: plots produced in the command line can be saved in various formats
    o New: the menu dialogs and the command line in the interface work with the
      same objects in the workspace
    o New: function findRows(), to find patterns of rows in a truth table,
      usually to be served as the "omit" argument in the function eqmcc()
      (thanks to Eva Thomann for the suggestion)
    o New: argument "clabels" to function XYplot() to add case labels to the plot
    o Changed: function compute() now returns the scores for the entire expression
      while for individual paths it has gained an argument called "separate"
    o Changed: deprecated functions is.tt(x), is.qca(x), is.sS(x), is.deMorgan(x)
      and is.pof(x), in favor of the more consistent, for example, is(x, "tt")
    o Changed: reverted value of argument "hclustm" to "complete", and default
      value of argument "distm" to "euclidean", in the function findTh()
    o Improved: for argument sort.by in function truthTable(), it is now possible
      to use "+" and "-" to signal "increasing" or "decreasing"
    o Improved: splitting strings now possible using "+" and "-" to signal
      "increasing" or "decreasing", when using sort.by in function truthTable()
    o Fixed: an outstanding bug assigning cases from truth table rows to solution,
      when subsetting based on the frequency threshold (thanks to Nena Oana and
      Carsten Schneider for the report)
    o Fixed: diagonal and middle guides in XYplot were drawing outside of the
      plot region when using multiple plots in the same graphics device
    o Fixed: bug in the GUI version of calibrate(), when switching from fuzzy to
      crisp it preserved the names of the thresholds and triggered an error
    o Fixed: bug in assigning rownames to a matrix, when selecting rows from the
      truth table based on the frequency cut-off
      (thanks to Ben Gibson for the report)

Version 2.2
    o New: first attempt of an R console in the web GUI
    o New: function XYplot()
    o New: functions fuzzyand() and fuzzyor() at user level
    o Changed: entire documentation of the package is now rewritten and more clear
    o Changed: all core, inner functions moved to package QCA
    o Changed: function demoChart() renamed to makeChart()
    o Changed: arguments "incl.cut1" and "incl.cut0" replaced by "incl.cut"
      (but still backwards compatible), for eqmcc(), pof() and truthTable()
    o Changed: binomial inference testing requires a significantly greater value for
      both thresholds "incl.cut1" and "incl.cut0" to code the outcome as "1" or
      "C", in function truthTable()
    o Changed: binomial inference testing for function pof(), both one-tailed
      tests now have the alternative hypothesis "greater".
    o Changed: default value of argument "hclustm" to "ward.D2", and default
      value of argument "distm" to "canberra", in the function findTh()
    o Changed: argument "groups" with argument "n" for the function findTh()
    o Changed: arguments "p" and "q" to "below" and "above" in function calibrate()
    o Removed: argument "logical" from the function createMatrix()
    o Improved: the user interface for the calibrate() function
    o Improved: function pof() is now even more flexible, see examples
    o Improved: function truthTable() now faster for very large data
    o Fixed: correct treatment of the "PRI" column, if one of the causal
      conditions is also named "PRI" (for example the Porter data)

Version 2.1
    o New: function translate() for a SOP expression
    o New: function compute() for a SOP expression, using translate()
      (thanks to Jirka Lewandowski for suggesting both functions)
    o New: function retention() for calculating the retention probability of a
      csQCA solution, in different perturbation scenarios
    o New: the GUI is now able to draw Venn diagrams up to 7 sets
    o New: better shapes of the Venn diagrams for 4 and 5 sets (especially for
      small intersections)
    o Fixed: minor bugs at the web interface
    o Fixed: minor bugs at the printing functions
    o Changed: function intersection() now uses translate(), which makes the
      argument "prod.split" obsolete, and argument "conditions" renamed to "snames"
    o Changed: argument "neg.out" in pof() and eqmcc() is now deprecated, but
      still backwards compatible. Negation of the outcome is detected by a "~"
      sign in front of the outcome name
    o Changed: complete rewrite of the factorize() function, now orders of
      magnitude faster for very complex inputs and producing more accurate
      results; it also automatically detects the product split, if a "*" sign
    o Improved: deMorgan() can also return products of sums
    o Improved: pof() function now accepts a SOP expression, in addition to
      current functionality

Version 2.0
    o Temporary split of the code between packages QCA and QCAGUI
    o New: first attempt of a Javascript based, graphical user interface
    o New: introduced function intersection()
    o New: introduced function recode()
    o New: introduced function export(), to create a column for the row names
    o Improved: a couple of relevant error messages, especially useful for the
      web context
    o Improved: the truthTable() function always returns a complete truth table
      but printed on the screen only if complete = TRUE
    o Improved: similarly, the truth table object always contains the cases,
      which are printed on the screen only if show.cases = TRUE
    o Improved: decreasing argument  in the truthTable() function can be a vector,
      to allow for complete flexibility when sorting by multiple arguments
    o Improved: argument thresholds in the calibrate() function now has names
    o Improved: functions pof() and superSubset() now accept additional measures,
      a first one being "ron" (for relevance of necessity), using the argument "add"
    o Improved: function pof() now recognizes "1 - " to automatically negate the input
    o Changed: component "opts" from the output of eqmcc() is now called "options"
    o Changed: argument "logistic" in the calibrate() function is now TRUE by
      default, for compatibility with fsQCA
    o Changed: removed formal argument "decreasing" in the truthTable() function
      (it is still recognised as an unformal argument, for backwards compatibility)
    o Changed: arguments from truthTable() and eqmcc() which needed vectors of
      values now accept a single character containing those values, separated
      by commas
    o Fixed: deMorgan() now able to negate disjunctions of single conditions
      (e.g. "A + B")
    o Fixed: intermediate solutions now properly identified in some particular,
      rare circumstances (thanks to Maarten Vink for the report)

Version 1.1-3
    o New: number of PIs processable by solveChart() now limited (maximum integer
      number that can be treated by the machine)
    o New: three data sets added (d.AS, d.HMN, d.Kil)
    o Improved: documentation for various functions
    o Changed: argument "all.sol" in function eqmcc() renamed to "min.dis"
    o Changed: argument "inf.test" in eqmcc() placed before "use.tilde"
    o Renamed: in output from various functions prefix "S" (solution) renamed to
      "M" (model)
    o Fixed: argument "neg.out" with curly bracket notation in argument
      "outcome" to function eqmcc() not operative
    o Fixed: matrix dimensions dropped in function getSolution()
    o Fixed: case names assigned to incorrect PIs in function
      demoChart() under some conditions (thanks to M. Vink)
    o Fixed: very large pof() objects did not generate an error on print
    o Fixed: more informative error message when the truth table did not contain
      any explained values (thanks to M. Zulianello)

Version 1.1-2
    o Fixed: missing data triggered an error message in function truthTable()
    o Fixed: calibration of negative end-point concepts with logistic function
      produced incorrect set membership scores (thanks to C. Schneider)

Version 1.1-1
    o Improved: speed for resolution of PI chart
    o Fixed: an error message was generated when fuzzy sets were not normalized
    o Fixed: prime implicants were joined together for single-column PI charts
      by function solveChart() instead of being identified as alternative solutions
    o Fixed: PRI column did not print in truth tables when argument PRI = TRUE

Version 1.1-0
    o New: functionality for analyzing path models with function eqmcc()
    o New: function deMorgan() computes negations of set expressions
    o New: functionality for multivalent outcome sets
    o New: inference-statistical tests for truth table configurations
      (currently only csQCA and mvQCA)
    o New: additional values "sufnec" and "necsuf" to argument "relation" in
      function superSubset()
    o New: argument "row.dom" in function solveChart()
    o Improved: documentation for function eqmcc()
    o Improved: output structure of eqmcc() with respect to intermediate solutions
    o Changed: default value to argument "row.dom" of function eqmcc() from TRUE
      to FALSE
    o Changed: argument "row.dom" works independently of argument "all.sol" in
      function eqmcc()
    o Renamed: arguments "rowdom" and "direxp" in function eqmcc() to "row.dom"
      and "dir.exp"
    o Renamed: values "necessity" (now "nec") and "sufficiency" (now "suf") to
      argument "relation" in function superSubset()
    o Dropped: function readTosmana()
    o Fixed: when number of solutions was large, printing was not optimal
    o Fixed: printing of column names (thanks to A. Sevilla)
    o Fixed: when providing directional expectations, empty "SA" components
      caused error
    o Fixed: sometimes redundant solutions were produced when "all.sol = TRUE"

Version 1.0-5
    o Improved: version of C code for removing redundant PIs
    o Improved: function pof() now also accepts outcome vector as well as a
      name of the outcome set
    o Improved: multiple solutions from function factorize() now numbered
    o Improved: C code in view of upcoming R 3.0.0 version
    o Changed: functions superSubset() and pof() now accept "suf" (along with
      "sufficiency") and "nec" ("necessity")

Version 1.0-4
    o New: argument "all.sol" for functions eqmcc() and solveChart()
      (thanks to  Michael Baumgartner for the suggestion)
    o Improved: speed for functions superSubset() and truthTable()
    o Improved: function truthTable() now also calculates number of cases in
      remainder configurations
    o Renamed: arguments in function factorize()
    o Fixed: in function eqmcc() condition names in uppercase letters were not
      treated correctly (thanks to Michael Baumgartner for the report)
    o Fixed: in function truthTable() case names were not assigned correctly
      under some circumstances (thanks to M. Gasser)

Version 1.0-3
    o Fixed: various printing issues

Version 1.0-2
    o New: argument "neg.out" in functions truthTable() and eqmcc()
    o Fixed: PRI scores for arguments relation = "necessity" and neg.out = TRUE
      in function superSubset()

Version 1.0-1
    o Fixed: printing of solutions with only one term was prevented

Version 1.0-0
    o New: functions eqmcc() and truthTable() now able to process fuzzy sets
    o New: function pof() computes parameters of fit for variety of input options
    o New: function findTh() finds thresholds for crisp sets calibrations
    o New: function calibrate() recodes base variables into crisp and fuzzy sets
    o New: function superSubset() for analysing necessity and sufficiency relations
    o New: logical argument "rowdom" in function eqmcc() controls application of
      row dominance principle
    o New: inclusion ("incl") and proportional reduction in inconsistency scores
      ("PRI")
    o New: truth tables can now be sorted using argument "sort.by"
    o New: function truthTable() now returns raw truth table with numerical columns
    o New: printing methods for PI charts (objects of class "pic"), parameters
      of fit (class "pof"), results from function superSubset() (class "ss"),
      results from function allExpressions() (class "aE") and results from
      factorization (class "fctr")
    o Improved: function eqmcc() automatically determines conditions and outcome
      when truth table object passed (object of class "tt")
    o Changed: functions prettyTable() and createString() now internalized
    o Renamed: function findPrimes() to findSubsets()
    o Dropped: function qmcc(), fully replaced by function eqmcc()
    o Dropped: truth table columns "freq0" and "freq1"

Version 0.6-5
    o Improved: functions qmcc() and eqmcc() now also return (invisibly) PI
      chart and initial configurations

Version 0.6-4
    o Improved: functions qmcc() and eqmcc() now return invisible list with
      following components: minimized PIs, number of k PIs necessary to cover
      all initial causal combinations in PI chart, final solution(s)
    o Changed: redundant code from function verify.data() removed
    o Changed: error message on failure to solve PI chart (thanks to J. Jarvi)

Version 0.6-3
    o Fixed: in function factorize(); matrix dropped dimensions

Version 0.6-2
    o Improved: documentation and citations
    o Improved: function findPrimes(); empty prime implicants eliminated (first
      line in implicant matrix)
    o Changed: function factorize(); argument "use.letters" replaced by "splitmethod"
    o Fixed: in function findSubsets(); incorrect calculations for the case of
      multi-value data

Version 0.6-1
    o Improved: functions findPrimes() and findSubsets(); argument "noflevels"
      must now be specified
    o Changed: argument "uplow" in function eqmcc() now TRUE by default
    o Fixed: incorrect multi-value minimization in function eqmcc() when remainders
      excluded (thanks to D. Bol)

Version 0.6-0
    o New: function eqmcc() now accepts multivalent data
    o New: argument "uplow" in function eqmcc() for printing solutions in
      upper/lower case letters
    o New: artifical dataset "MV" to test multivalent data
    o Improved: function findPrimes() to accommodate multivalent data
    o Improved: function createString() to accommodate multivalent data
    o Improved: function writePrimeimp() to accommodate multivalent data
    o Improved: function prettyString() using native function strwrap()
    o Improved: functions qmcc() and eqmcc() using new function prettyString()
    o Changed: function demoChart(); argument "use.letters" replaced by
      "splitmethod"
    o Changed: function prettyString() now internalized

Version 0.5-4
    o Dropped: error message when there is only one configuration to explain
      (thanks to B. Monroe)

Version 0.5-3
    o New: function truthTable() now allows multivalent data in conditions
    o Fixed: in function truthTable(); columns incorrectly arranged with respect
      to outcome values

Version 0.5-2
    o Fixed: function createMatrix() regarding multivalent data
    o Fixed: function solveChart(); error when PI chart was too large

Version 0.5-1
    o Improved: function descriptions
    o Changed: functions is.tt() and print.tt() now user accessible
    o Fixed: function rowDominance2(); matrix dropped dimensions
    o Fixed: function eqmcc() for complete truth tables (thanks to R. Huang)

Version 0.5-0
    o Function truthTable() now returns object of class "tt"
    o New: internal functions is.tt() and print.tt()
    o Improved: functions qmcc() and eqmcc() now accept truth tables or raw data

Version 0.4-9
    o Improved: function factorize(); previous version did not detect some
      combinations
    o Changed: functions findPrimes() and findSubsets() now at user level

Version 0.4-8
    o New: internal function findPrimes()

Version 0.4-7
    o New: internal function findSubsets()
    o Improved: function eqmcc()
    o Improved: function truthTable()
    o Fixed: function rowDominance2()

Version 0.4-6
    o Improved: eqmcc() now at least twice as fast
    o Changed: function rowDominance2()
    o Renamed: function shortqca() to eqmcc()

Version 0.4-5
    o New: experimental function shortqca(); many times faster than qmcc() for
      large number of conditions (> 11) and very low memory consumption;
      works with 16 or 17 conditions

Version 0.4-3
    o Fixed: in function qmcc() matrix dropped dimensions upon subsetting

Version 0.4-2
    o New: argument "use.letters" to function demoChart()
    o Fixed: in function qmcc() data was subset incorrectly
    o Fixed: in function qmcc() involving argument "show.cases"
    o Fixed: function verify.truthTable()

Version 0.4-1
    o New: namespace for "QCA" package
    o New: argument "diffmat" to function qmcc(); users can now choose to
      generate difference matrix or not: speed or low memory consumption
    o Improved: function base3rows() now faster
    o Improved: function createMatrix() now faster for same number of values in
      each condition

Version 0.4-0
    o New: function base3rows()
    o Improved: function qmcc(); lower memory consumption;
      now works with up to 15 conditions in 1GB RAM
    o Fixed: function writeSolution()

Version 0.3-5
    o Improved: function qmcc(); does no longer possess argument "tt";
      now works with up to 13 conditions
    o Changed: function truthTable()

Version 0.3-1
    o New: function rowDominance() facilitates solving of large prime implicant
      charts

Version 0.3-0
    o New: function getRow() returns combination of levels for specific row numbers
    o New: function createMatrix() now accepts multi-value sets
    o Improved: function qmcc() now 20 times faster
    o Changed: function createChart() redesigned and internalized
    o Renamed: function createChart() to demoChart()
    o Fixed: various problems caused by changes in version 0.2-6

Version 0.2-6
    o New: "QCA" package does not depend on package "cluster" any more

Version 0.2-5
    o New: "QCA" package no longer depends on package "combinat"
    o New: function sortMatrix() in internal functions
    o New: argument verifications now part of internal functions
    o New: function readTosmana() for reading Tosmana type XML data files
    o Improved: documentation for many functions
    o Changed: function prettyTable()
    o Changed: minor parts in function truthTable()

Version 0.2-2
    o New: internal functions; function qmcc() now less cluttered
    o New: user-level function solveChart(); pulled out of function qmcc()
    o Improved: allExpressions() now faster
    o Renamed: function allExpr() now allExpressions()

Version 0.2-1
    o New: function createMatrix() creates base matrix for truth tables
    o New: function base3rows()
    o Fixed: in function writeSolution()

Version 0.2-0
    o New: function factorize() finds all common factors in Boolean products
