[Paraview] Test for 0005688: Parallel structured volume rendering intermixed with polydata broken.

[Kevin H. Hobbs]

I would like to create a test for bug 0005688
http://www.cmake.org/Bug/view.php?id=5688 and I need some advice about
how to go about it. 

I tried recording a test that:
	used the built-in serial server
		created a wavelet source
		set it to use volume rendering
		adjusted the volume rendering to be more transparent
		created a sphere source with center 6,0,0 and radius 4
		saved a test image
		deleted the sphere and wavelet source
	switched to a local parallel server
		created a wavelet source
		set it to use volume rendering
		adjusted the volume rendering to be more transparent
		created a sphere source with center 6,0,0 and radius 4
		and saved a second test image

The recording went fine and I posted the xml and png files at
	http://crab-lab.zool.ohiou.edu/kevin/mixed_vol_and_surf_test/
but when I play the test file paraview crashes. I played the test again
in paraview run in ddd and got a backtrace.
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