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Marcus Mohr authored
Commits places the following free functions in the new file VTKHelpers.hpp - writeXMLHeader() - writeXMLFooter() - writePieceHeader() - writePieceFooter() They now belong to the namespace vtk. We also convert VTKOutput::openDataElement() into a free function, placed in the same file and namespace as above. Additionally we remove the class enum VTKOutput::VTK_DATA_FORMAT and replace it by vtk::DataFormat. The private methods - writeP1() - writeVertexDoFData() - writeP1VectorFunctionData() are now members of a new VTKP1Writer friend class. The private methods - writeP2() - writeSingleP2Function() - writeSingleP2VectorFunction() are now members of a new VTKP2Writer friend class. The private method - writeDGDoF() is now a member of a new VTKDGDoFWriter friend class. Finally we modify the VTKOutputTest so that some data are actually written in base64 encoded binary
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