Cleaned up and fixed transmit filters for structured data.

Filters/Parallel/CMakeLists.txt

Filters/Parallel/Testing/Cxx/TransmitImageData.cxx

Filters/Parallel/Testing/Cxx/TransmitImageDataRenderPass.cxx

Filters/Parallel/Testing/Cxx/TransmitRectilinearGrid.cxx

Filters/Parallel/Testing/Cxx/TransmitStructuredGrid.cxx

Filters/Parallel/Testing/Python/CMakeLists.txt

Filters/Parallel/Testing/Python/testTransmit.py

Filters/Parallel/vtkTransmitPolyDataPiece.cxx

Filters/Parallel/vtkTransmitPolyDataPiece.h

Filters/Parallel/vtkTransmitRectilinearGridPiece.cxx

Filters/Parallel/vtkTransmitRectilinearGridPiece.h

Filters/Parallel/vtkTransmitStructuredDataPiece.cxx

Filters/Parallel/vtkTransmitStructuredDataPiece.h

Filters/Parallel/vtkTransmitStructuredGridPiece.cxx

Filters/Parallel/vtkTransmitStructuredGridPiece.h

Filters/Parallel/vtkTransmitUnstructuredGridPiece.cxx

Filters/Parallel/vtkTransmitUnstructuredGridPiece.h

Filters/ParallelImaging/vtkTransmitImageDataPiece.cxx

Filters/ParallelImaging/vtkTransmitImageDataPiece.h

IO/ParallelXML/module.cmake