changed from nicolai 10. mai
Merge remote-tracking branch 'origin/feature_exporter_hiflow3'

Conflicts:
	operators/MiscMeshOperators/MiscMeshOperators.cpp
	operators/MiscMeshOperators/MiscMeshOperators.h
	src/msml/ext/misc.py
	src/msml/msml.xsd
introducing CMake MSML_LIBRARY Macro
hiflow3 fixes on sort logic

* typo fix in CGAL CmakeLists.txt
* add Nicolai's convert vtk to vtu
* fixes in hiflow3 exporter