Introduce FunctionBagPlot and related filters.

Add a new plot type to draw functional bag plots.

Add vtkExtractFunctionalBagPlot filter to generate the two 2
components columns needed to fee a functional bag plot.

Add a TransposeTable filter to transpose tables, options allow
to create a new column containing initial row names, and use such
a column to name the new columns.

Change-Id: If7fedd9b99038ab7924f5e9b170ed72bd02f9189
Merge topic 'FunctionalBagPlot' into master

bdb8bbf7 Introduce FunctionBagPlot and related filters.