Support Stacked Bar Plots
For vtkPlotBar, SetInputArray can be used to identify input series' beyond index 1. When this is done, each additional series will be plotted on top of the previous series as a stacked bar plot. To handle this change, vtkPlot now handles multiple labels that can be associated with each of the plots. PaintLegend and GetNearestPoint have been adjusted to deal with this properly.
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