Only allow selection on visible blocks

This updates the composite poly data mapper to only allow
selections for visible blocks.

Change-Id: Ib971062717dcb056e65f0adc42ff012d9892c0bf
Fix display attribute handling in vtkCompositePainter

This fixes the handling of applying block display attributes
in the vtkCompositePainter::RenderBlock() method.

Change-Id: I61a3bf2085266b87868af3dc6548bff319ab186c
Merge topic 'composite-data-display-attributes' into master

3dd5f751 Fix display attribute handling in vtkCompositePainter
82aee804 Only allow selection on visible blocks