[vtkusers] PVTI not Parallel

[Kevin H. Hobbs]

I think there's something wrong with vtkXMLPImageDataWriter. When I try
to write a tiny piece of a large image the memory consumption is huge.
This suggests that the whole image is being read in instead of only
enough to write the piece.  This makes cluster processing of large
images difficult. I've attached an example program. Please note that the
image I load is  1090 * 1080 * 1345 / 2^30 = 1.5 GB.
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