computeSemblanceOneFeature
                        Compute semblance when there is only one
                        feature, given as a vector x.
computeSemblanceOneFeature_Gini
                        Compute semblance when there is only one
                        feature, given as a vector x, but weight the
                        feature by its Gini coefficient. Use for data
                        with strictly positive values.
makeUpperLower          Make the upper triangular part the same as the
                        lower triangular part.
ranksem                 Compute Semblance For a Given Input Matrix or
                        Data Frame
ranksem_Gini            Compute Gini-weighted Semblance
repCol                  Make a matrix by repeating vector v into n
                        columns
repRow                  Make a matrix by repeating vector v into n rows
