Avoid integer overflow when clipping large volumes.
I encountered a segmentation fault when attempting to clip a stack of tiffs (vtkImageData) in ParaView and, using the undefined behavior sanitizer, tracked it down to integer overflow. The changes below change some values from
vtkIdType to avoid that.
This python script reproduces the issue. It runs without issue on this branch but causes a segmentation fault on master. It does use a lot of memory and I haven't tried it on a machine with less than 128 GB RAM.