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[bugfix] Lifetime of vtkMPIController in vtkInSituInitializationHelper

Nils Dreier requested to merge florian.ziemen/paraview:catalyst_mpi_comm_fix into master

This MR extents the scope of the vtkMPIController in vtkInSituInitializationHelper::Initialize to avoid destruction.

Before the controller got destructed directly, as vtkMultiProcessController only holds a vtkWeakPtr to the global controller. The led to problems when using catalyst on subset of MPI_COMM_WORLD.

Edited by Nils Dreier

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