Added preliminary Netgen support
Merge branch 'master' of https://github.com/CognitionGuidedSurgery/msml
Build fix
fix #124
Merge remote-tracking branch 'origin/master'
introducing `target` attribute for Slots
check if rerun of operator can omitted
finish, check of needed reruns
finish, check of needed reruns

additionally generation of output target filenames
fixes #125
Merge branch 'master' of /home/suwelack/git/MSMLExtended/msml with conflicts.
Merge branch 'master' into hnn_example