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fix vtkPointGaussianRepresentation parallel rendering issues

Utkarsh Ayachit requested to merge utkarsh.ayachit/paraview:fix-point-gaussian-repr into master

vtkPointGaussianRepresentation was generating dataset without cells. vtkRedistributeDataSet doesn't support redistributing data without cells. Fixed vtkPointGaussianRepresentation for now by ensuring we create cells.

vtkPointGaussianRepresentation was also creating imbalanced MB which could cause vtkRedistributeDataSet deadlock. Fixed by letting the executive handle the looping over composite datasets -- simplifies the code, anyways.

vtkPointGaussianRepresentation was also not calling vtkPVRenderView::SetOrderedCompositingConfiguration. Fixed that.

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