[vtkusers] Test failures from glReadPixels

[Kevin H. Hobbs]

Every dashboard test that involved an image comparison on the mesa build on 
murron.hobbs-hancock was failing.

I traced the problem all of the way back to the call to glReadPixels in 
Rendering/vtkOpenGLRenderWindow.cxx.

There are two calls: the main one, that reads a whole block of RGB pixel data 
from the window, and one to work around a bug, that reads RGBA pixel data 
line by line.

I commented out the main one and left the bug workaround one, and now most 
tests are passing.

I'm using Mesa from git, Fedora 9, x86_64... 

Does this give anybody a hint as to what might be going wrong?
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