Remove code deprecated in 6.3
terminus:VTK cory.quammen$ git grep VTK_LEGACY | grep "6\.3"
IO/NetCDF/vtkNetCDFCAMReader.cxx: VTK_LEGACY_BODY(vtkNetCDFCAMReader::SetCellLayerRight, "VTK 6.3");
IO/NetCDF/vtkNetCDFCAMReader.cxx: VTK_LEGACY_BODY(vtkNetCDFCAMReader::GetCellLayerRight, "VTK 6.3");