[FIX](lint) Some NetBeans contributions.
[IMP](null datums) No longer creating null datums for series/category combinations that are not present in the data.
[IMP](datum marks) Removed the mark properties: _datum_, _group_ and __scene_; these were no longer needed
[CHG](visibleData) Moved this group of methods to the BaseChart class.
[REF](RoleVarHelper) This helper is now being used to fill every non-trivial measure-like scene variables.
[FIX](Chart Panel axes visualRoles) A lot of references to the chart's axes and visualRoles, instead of to the local panel fields.
[FIX](HeatGridPanel colorRole) An error that occurred if the color role would be unbound.
[FIX](BarPanel BarPlot barStackedMargin) The option was being read directly from the chat options, instead of from the BarPlot.
[PERF](Animate) Added an _animatable property to charts to prevent performing animation of non-animated charts...
[FEAT](BarPanel ValuesMask) Added support for valuesMask in the Bar family charts
[PERF](animate) Prevent the additional animation render in non-animatable charts