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Cell data overhaul and texture buffers

Ken Martin requested to merge ken-martin/vtk:cell_data_overhaul into master

This patch makes VTK compatible with OpenGL 3.2 and defaults to using 3.2 on X windows and OSX. It also changes how cell data is handled. Instead of vertex duplication it uses texture buffers to store the cell data and gl_PrimitiveId to index into it.

This patch also add support for setting process, composite, and attribute (point/cell) indirection arrays for picking as needed by distributed rendering PV.

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