refactoring: 
- generic execute OpRuleCommands and OpRuleConstraints 
- preparation for CC rules
- code structure improvements
- generalised generation of operational rules
- moved rule specific parts to CreateRuleAttributeCommand
- removed auto generated TODOs that have been handled
extended feature:
- generation of CC rules
- application of consistency creating rules for
consistency checking of triple graphs
update of example: CD2RDBM, removal of backup files
some white space adjustments
repeat2while-example
repeat2while-example
Merge branch 'master' of https://github.com/de-tu-berlin-tfs/Henshin-Editor.git
improved documentation
Merge branch 'master' of https://github.com/de-tu-berlin-tfs/Henshin-Editor.git
improved example
removed old documentation file
added new feature: model synchronisation via fPpg and bPpg
corrected issue for closing TGG files
update of example for model synchronisation
BUGFIX: refresh of markers after forward and backward propagation
update of EMFConstraints for FT-translation
BUGFIX: corrected generation of operational rules: creation of edges in
NACs that have a marker of type t=?
Merged MarkerConstraints: Graph and EMF version are now replaced by the
pure EMF version.
added error message if there are no operational rules for the action
update of example for Xtext - generated CC and BT rules
BUGFIX: solved NullPointer exception in case of the translation of
null-values
BUGFIX: resolved null pointer exception for automatic layout of
selections of subgraphs