Merged identical PublicWordSpec and MonadicWordSepc.
Renamed VmWordSpec to VmSpec.
Renamed PublicWordSpec to TosSpec.
Renamed PrivateWordSpec to SelfSpec.
Renamed DyadicWordSpec to NosSpec.
Renamed ClassWordSpec to ClassSpec.
Renamed LocalWordSpec to LocalSpec.
Renamed MacroWordSpec to MacroSpec.
Renamed VariableWordSpec to LocalVarSpec.