Fixes BUG #7786. This covers a broad array of fixes/enhancments including:
* Histrogram filter produces vtkTable.
* Charts now use vtkTable (instead of vtkRectilinear grid).
* Charts can plot any attribute data.
* CSV Reader reads in vtkTable instead of vtkRectilinear.
* Spreadsheet view cleanup --  the streaming logic is now more streamlined :).
* Selection widget performance -- when a large number of cells/points were
  selected/unselected, the client would take a lot of time updating the
  selection inspector panel. This is now fixed.
* Merging vtkTimeSeriesWriter into vtkParallelSerialWriter and fixing it to work
  with arbitrary data-objects rather than just vtkPolyData.