[FIX](Complex) A bug in ensureLabel method that caused an existing label to be overwritten and being calculated every time
[FIX](AxisPanel tick hiding) Applied correction factor to labelSpacingMin for when it is being evaluated vertically or horizontally. Yields more similar spacing for different angles
[FIX](Treemap) The items included in the legend for ColorMode 'by-parent'
[FIX](Sign) In events, the Sign instance didn't have the expected properties index, scene, pvInstance. This could cause strange behavior.
[FIX](ValueLabel) Deactivated actions and tooltips on value labels due to the problem of tooltips being stolen from the target element. When this is solved, interaction may return value labels.
[FIX](HeatGrid V1 Compat) Using compatVersion method as if it were a boolean.
[FEAT](Treemap) Added option 'RootCategoryLabel'
[FEAT](Treemap ValueLabel) Added ensureReadable text option, that ensures the text color has enough contrast in relation to its background color. To be added as a plot option, along valuesMask,...
[FEAT](Grouping) The GroupingSpec.flattenRootLabel was renamed to GroupingSpec.rootLabel, so that it can be used in non-flattened groupings (like that of the treemap)
GroupingOper now supports the GroupingSpec.rootLabel in flattened or non-flattened groupings
[FEAT][PERF](Interactive) Scenes, signs, panels and charts now all use the same Interactive mixin for querying about interactiveness
A Scene now also limits the available interactions, independently of the sign.
Performance has been improved due to the use of bit masks that cache accumulated results, at the various levels: Chart -> Panel -> Sign.
The Context now centralizes event handling and checks for the conjunction of Scene & Sign interactiveness.
[FEAT](Scene) Added isSelectedDescendantOrSelf method, a pair of isActiveDescendantOrSelf
[FEAT](pv.Mark) Added getContext method, pairing with getScene and getSign to support marks without signs.
[FEAT](def.bit.set) Added bit masks handling function
[FEAT](protovis pv.Color) Added alphaBlend method
[FEAT](protovis pv.Color) Added isDark method, for classifying a color as dark or bright
[FEAT](protovis pv.Color) Added complementary method for calculating the complementary color
[REF](Grouping) The caching code to make it easy to support the additional caching key parameter
[REF](Parse Enums) The functions pvc.parseZZZ for parsing enumerations. Added the enum parser factory function: pvc.makeEnumParser