vtkHDFReader: improve static mesh support

Lucas Givordrequested to merge
lucas.givord/vtk:improve_static_support_in_hdf_reader into master
  • ensure to not use the UseCache and MergeParts at the same time (incompatible features)
  • ensure to delete meta array used for the static mesh correctly
  • fix VTK_ABI_NAMESPACE_END

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