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vtkXMLCompositeDataWriter: make MakeDirectory() virtual and prevent redundant directory creation in parallel

Cory Quammen requested to merge cory.quammen/vtk:xml-composite-make-directory-fix into master

Make it virtual and override it in vtkXMLPMultiBlockDataWriter so that only rank 0 tries to create the directory where pieces are written.

Backport: release Backport: paraview/release

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