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vtkRedistributeDataSet bug fix: remove duplicate points

Yohann Bearzi (Kitware) requested to merge yohann.bearzi/vtk:redistribute-data-duplicate-point into master

vtkRedistributeDataSet could output duplicate points at the interfaces where the previous partition splitting was occurring. This duplicate could make downstream filters fail (such as vtkGhostCellsGenerator). This could be worked around by calling a cleaning filter right after vtkRedistributeDataSet.

This commit makes the cleaning step unnecessary. The point duplication was caused by calls to vtkAppendFilter on which MergePoints was turned off.

A call to vtkAppendFilter at the very end of the pipeline is also removed in the instance of vtkUntructuredGrid output.

Adresses paraview/paraview#21161 (closed)

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