message: Replace some std::endl with newline character
  Note that std::endl flushes the buffer, so we can get better
  performance by using newlines when there is no need to flush.
diff: @@ -944,12 +944,12 @@ void ParaViewDataCollection::SaveDataVTU(std::ostream &out, int ref)
  {
  out << " compressor=\"vtkZLibDataCompressor\"";
  }
  - out << " version=\"0.1\" byte_order=\"LittleEndian\">" << std::endl;
  - out << "<UnstructuredGrid>" << std::endl;
  + out << " version=\"0.1\" byte_order=\"LittleEndian\">\n";
  + out << "<UnstructuredGrid>\n";
  mesh->PrintVTU(out,ref,pv_data_format,high_order_output,compress_output);
  // dump out the grid functions as point data
  - out << "<PointData >" << std::endl;
  + out << "<PointData >\n";
  // save the grid functions
  // iterate over all grid functions
  for (FieldMapIterator it=field_map.begin(); it!=field_map.end(); ++it)
  @@ -966,10 +966,10 @@ void ParaViewDataCollection::SaveDataVTU(std::ostream &out, int ref)
  // this one is not implemented yet
  SaveQFieldVTU(out,ref,it);
  }
  - out << "</PointData>" << std::endl;
  + out << "</PointData>\n";
  // close the mesh
  - out << "</Piece>" << std::endl; // close the piece open in the PrintVTU method
  - out << "</UnstructuredGrid>" << std::endl;
  + out << "</Piece>\n"; // close the piece open in the PrintVTU method
  + out << "</UnstructuredGrid>\n";
  out << "</VTKFile>" << std::endl;
  }
  @@ -993,7 +993,7 @@ void ParaViewDataCollection::SaveGFieldVTU(std::ostream &out, int ref_,
  out << "<DataArray type=\"" << GetDataTypeString()
  << "\" Name=\"" << it->first;
  out << "\" NumberOfComponents=\"1\" format=\""
  - << GetDataFormatString() << "\" >" << std::endl;
  + << GetDataFormatString() << "\" >\n";
  for (int i = 0; i < mesh->GetNE(); i++)
  {
  RefG = GlobGeometryRefiner.Refine(
  