[vtkusers] Modifications to vtkOpenGLPolyDataMapper.cxx vtkOpenGLProperty.cxx

[John Biddiscombe]

Ken, Goodwin, etc

>Please make sure the tests all pass

I'm getting 12 new fails due to the changes. I submitted an experimental
dashboard, but it doesn't seem to be showing up, so I'll have another go
tomorrow. The wireframe changes cause some pixel differences in several
images, but more seriously there seems to be a disruption of some facets in
a handful of others. Some facets appear dark or black, can't quite tell
what's going on.

Will stave off a commit for now.

JB