[Paraview] Mesa tests failing

[Kevin H. Hobbs]

( Berk, sorry for the dupe' 4096x2048 makes for a big PNG that was too big for 
the list )

I am continuing a thread from July since I have new information.

http://www.paraview.org/pipermail/paraview/2008-July/008707.html

The original problem was that the mesa builds of VTK and ParaView on 
murron.hobbs-hancock can not save the output of render windows to files 
correctly. 

In messing around with one of my VTK programs that saves a render window to a 
PNG file I was able to create correct output.

When I tell the vtkWindowToImageFilter to SetInputBufferTypeToRGB the output 
is incorrect but whel i tell it to SetInputBufferTypeToRGBA the output is 
what I expect.

The source, RGB, and RGBA images are posted at:

http://crab-lab.zool.ohiou.edu/kevin/OSMIPVolumeRender.cxx
http://crab-lab.zool.ohiou.edu/kevin/out_rgb.png 
http://crab-lab.zool.ohiou.edu/kevin/out_rgba.png 

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