updated hiflow3, added pressure constraint
extensions and corrections to HiFlow3 exporter, addons to msml-alphabet in msml.xsd, putting Nico as author, too, and adding a HiFlow3-bunny-example to run_examples.py
Fix: missing return value
Fix: wrong usage of VTK smart pointers
run examples except cli argument
Merge branch 'master' into droneio_fix
fix c++ for c++03 standard