Fix unused variable warning

Change-Id: Ic5b46c7edc0164e18f9527264b180ce34f05f9eb
A first cut at a CompositePolyDataMapper2

So this is a very different use case from what we have done so far.
In many ways this is the lots of independent actors case with the
exception that they are not fully independent. There were a number
of CPU botlenecks hindering this classes performance:

  stl maps and strings
  recomputing shaders/uniforms
  GetInput/SetInput (touching the pipeline is bad)
  Default Culler

There are a couple open issues with this change. I'm
not thrilled with the CurrentInput approach in PolyDataMapper
but SetInput and GetInput really are expensive. Second there is
an issue if a bunch of datasets share a single
large pointset. Right now we duplicate the pointset VBO for each
dataset. Will need a VBO cache at some point to allow actors/etc
to share a pointset or have the VBO building only populate the
VBO with the points actually used by the cells (or both).

This patch also contains a minor fix to the VAO missing an
initialization for ForceEmulation.

Change-Id: If2cf9531a26838b0fd8d47dafd1dcff6d4133c4b
Merge topic 'add_composite_mapper' into master

c75f3f6f A first cut at a CompositePolyDataMapper2
Merge topic 'warning_volumeopenglnew' into master

174238e0 Fix unused variable warning
Fix compiler warning and increase test threshold

Change-Id: If45d81f419bcde612b77ad1b8e088f2db3118680
Merge topic 'minor_test_fix' into master

f704378a Fix compiler warning and increase test threshold
Cache camera and actor matrices for performance

With many actors they are used over and over again and computing
them is expensive.

Change-Id: I7e2ab5d17a089c7f9bfebffe754c6ea6fcb65319
Remove the unused old code

Change-Id: I5327eb5aa9002b59e77c96d4fcce527026ad0508
Merge topic 'some_matrix_optimizations' into master

cf1516a2 Remove the unused old code
69d845e3 Cache camera and actor matrices for performance
Merge remote-tracking branch 'origin/master' into opengl2_volumerendering

Change-Id: I38a955b3be37fbabdedb809676fa1a402f40c10b