corrected feature type: perpendicularity needs a directional feature
cleaned loading of OWL files
added feature_properties description for point features; uses zero vector if position not given (i.e. if all positions are relative to the object center, this will denote the object center itself)
introduced named class for pancakemix restriction to make clearer that all three motions basically share the same tool
Merge branch 'master' of https://github.com/knowrob/knowrob_addons