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Add vtkNek5000Reader class to VTK. This reader, authored by Jean Favre at the Swiss National Supercomputing Center, was migrated, more or less "as-is" from the following GitHub repository: https://github.com/jfavre/ParaViewNek5000Plugin Moving this reader into VTK proper also required moving two classes, vtkCleanUnstructuredGrid and vtkCleanUnstructuredGridCells, from ParaView "VTKExtensions" into VTK.
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