[FIX](Data Null) Existing null values were not being interned, which later caused erroneous behavior in Dimension.extent.
[FIX](Tooltips) Would not show if not clickable and not selectable and not hoverable.
[FIX](Color Continuous-Discrete Scale) Had no domain and range methods.
[FIX](RoleVarHelper roleVar) Allow fixating the role var name, so that any role can be used and the created var remains the same.
[FIX](RoleVarHelper percent) Was not creating the percent sub-var in some cases.
[FIX](HG nulls) A HG with an all-nulls column or row would not be laid out correctly, placing all existing columns/rows consecutively, without respecting the empty column/row.
[FIX](MetricPoint Size) Having a null size role (like in "trend" panel situation) would produce an error.
[FIX](MetricPoint TrendLines) Would not appear, if the series role was not bound.
[FIX](MetricPoint Discrete Color) Dots would not appear if the color role was bound to a discrete null-only dimension.
[IMP](MetricPoint HG Shape) The cross shape has only stroke and now has a bigger line width.
[IMP](Scales Log) Augmented the line width of stroke only shapes like the 'cross' shape).
[IMP](log group) Logging groups are now collapsed