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VTK: fix crash - 1D/2D data with opacity in distributed

Bring fix in vtkDIYKdTreeUtilities preventing ParaView to crash when displaying 1D or 2D data with opacity with distributed rendering (numproc should be > 2 in 1D, > 4 in 2D). Also fixes crash when using Adaptive Resample to Image filter in the same conditions, which also rely on the same mechanism.

Please note that test has been added in VTK but no XML integration test can be added here, since we cannot specify a number of ranks (current limitation, hardcoded to 2).

Edited by Thomas Galland

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