STYLE: merged all subroutines defined in vtkYoungsMaterialInterfaceXxx.h files to vtkYoungsMaterialInterface.cxx to respect CDash's Header-Graphics test requirements
STYLE: merged all subroutines defined in vtkYoungsMaterialInterfaceXxx.h files to vtkYoungsMaterialInterface.cxx to respect CDash's Header-Graphics test requirements

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