Remove federkiel test
Replace IHomogeneousConstituentAlternatives with FeatureStructure in simple cases
Remove redundant grammarSymbol (already in features)
GrammarFSUtil.addGrammarSymbol
Rename RoleFrameSlot to RestrictedFSSet
Replaced RoleFrameCollection with RoleFrameSlot (slower?)
Replace FillInSlotWith with plain FeatureStructure
Semantics part of Feature Structure