-- Introduction --      echarty
ec.clmn                 Data column format
ec.data                 Data helper
ec.fromJson             JSON to chart
ec.init                 Initialize a chart
ec.inspect              Chart to JSON
ec.paxis                Parallel Axis
ec.plugjs               Install Javascript plugin from URL source
ec.registerMap          Register a geoJson map
ec.theme                Themes
ec.upd                  Update option lists
ec.util                 Utility functions
ecr.band                Area band
ecr.ebars               Error bars
ecs.exec                Shiny: Execute a proxy command
ecs.output              Shiny: UI chart
ecs.proxy               Shiny: Create a proxy
ecs.render              Shiny: Plot command to render chart
