VTK Bug #16736: Add large data support&test for vtkMPIImageReader
The "ReadSlice" method in 'vtkMPIImageReader' can only read raw data if the dataset is within 2^31 elements. Using the same technique in Merge Request !1510, we can use a while loop to extend its ability to read the large data slice by slice. A test file is also added for vtkMPIImageReader class.
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