[vtkusers] Bug in XML Image IO?

[Kevin H. Hobbs]

The random numbers don't seem to make a difference except in the
compression ratio, so I took them out and used an image full of zeros. I
also tried other image sizes and numbers of streamed pieces and
reproduced the errors.

x	y	z	pieces
10	10	10	1	// works
100	100	100	1	// works
100	100	100	2	// works
100	100	100	4	// works
100	100	100	8	// works
100	100	100	10	// produces errors reading extents
100	100	100	100	// produces a backtrace
200	200	200	1	// works
200	200	200	8	// works
200	200	200	10	// produces errors reading extents
200	200	200	100	// segfaults
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