Attempt to address thread issues in the space leaping filter
Bug report http://www.vtk.org/Bug/view.php?id=12115 related to failures when using a large number of threads. The fix enforces non-overlapping output extents, so that two threads don't write to the same data at the seams. Also address a valgrind detection of an uninitialized var. The TableSize passed down must be initialized.
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