comments added
variance propagation for conversion from polar to cartesian coordinates #22
fixes #26: after editing the group name in the filtered table view you can now select another feature
start implementation of plugin manager #8
Merge branch 'master' into task_benedikt

Conflicts:
	controller/controller.cpp
	openIndy.pro
nominals are now sorted next to their actual features. #17
bugfix delete feature (index out of range after a feature was deleted)
Merge branch 'master' into task_Jens
Merge branch 'master' into task_Jens
moved create feature function, sort function, add nominal to actual feature and other feature depending functions from controller to featureUpdater class. They are now static functions and can be called at several places