Deprecating vtkVisibleCellSelector and vtkIdentColoredPainter. It was difficult
to extend the current implementation to support new mappers that can participate
in selection.

Added new vtkHardwareSelector (replacement for vtkVisibleCellSelector).
vtkHardwareSelector works in conjunction with vtkRenderer to perform selection.
Any mapper that supports selection should return true in GetSupportsSelection().
Then when rendering opaque geometry, if the mapper sees that
vtkRender::GetSelector() is non-null, then it takes special steps to render for
selection. vtkHardwareSelector provide public call-backs BeginRenderProp(),
EndRenderProp(), RenderAttributeId() which the mapper should use to ensure that
correct color information is rendered.

To ensure that point selection works correctly ParaView now disables
MultiSampling altogether. This works around issues with NVidia drivers on linux
boxes.