* Fixed tooltip showing null values/empty labels when aggregating as list.
* Fixed Sunburst and Treemap plots, that had broke, in the meantime.
* Improved axis/visualRole compatibility error messages
* Fixed unregistered normalized bar plot
* Added plot / chart restrictions to the pie, sunburst and tree map.
* Added way for info associated with a certain data cell to be stored in an axis via methods Axis#setDataCellScaleInfo,getDataCellScaleInfo. This solved a problem of storing by-products of the scale domain calculation code in the waterfall (_ruleInfos).
* Plots now store their generated data cells, allowing for latter retrieving the data cells of a certain role, and getting its ScaleInfo information from the axis.
* DataCells now have a key that allows an axis to store info associated to it.
* Waterfall now better supports multiple plots of its type; validates that both plots agree on water direction, by traversal modes conciliation.
* Moved _calAxesOffsetPadding from the plot panel to the chart class. This is much more efficient, and the right place to do the calculations.
* Fix bug of plotPanelList not being cleared on re-render, causing subsequent renders to then use stale layout information to configure cartesian axes ranges.
* JSDocs - added comment to every extension points class saying that extension points can also be specified at the chart level. Internal plot extension points can also be specified at the chart-level.
* Improved/fixed use of visual roles that are discrete or continuous, and, when the later, also are isMeasure visual roles. These kind of visual role was not being considered a measure visual role, and that would affect null datum detection on read.
* Improved/fixed definition of continuous visual roles with more than one dimension, for which configurations like the valueType were being ignored, causing non-inheritance by the dimensions in the visual roles binding phase. In turn, this required additional dimension groups defaults to be defined, to achieve the same effect.
* Validate that the name of an external plot must not have a "." in it.
* Fix regression: no measure roles -> not is null.
* The chart's visual roles can now be referred to unambiguously by using the "$." prefix.
* The plot name cannot be "$".
* Added unit tests for these.
* First batch of documentation for plots and visualRoles options (JSDocs). Still need to check if CDE generation is ok.
  Still need to move visual roles to the plot classes.
* Fix build of "ccc" variant (global pvc), which was calling a define for registering the "pvc" module, at the end of the script.
* Second batch of documentation for plots and visualRoles options (JSDocs). CDE generation is ok.
  Visual roles moved to the plot classes.
* Fix discrete axis classes not having the ticks extension points facet.
* Fix site summary not including complex valued properties like readers, dimensions, ...