Add generation file info comment to the pvd files

src/output/VTKWriter.cpp

@@ -615,6 +615,7 @@ VTKWriter::_write(const std::shared_ptr<const MeshType>& mesh,
     std::ofstream fout(m_base_filename + ".pvd");
 
     fout << "<?xml version=\"1.0\"?>\n";
+    fout << _getDateAndVersionComment();
     fout << "<VTKFile type=\"Collection\" version=\"0.1\">\n";
 
     fout << "<Collection>\n";