Disable pattern matching disabling patch.
Merging in PDB source code to have better AspectJ/AJDT IDE support.
Marking all Rascal IValue implementations with marker interface IExternalValue.
Adding test cases for testing maximal sharing properties.
Adding protobuf definitions.
Adding default logging config.
Measuring accurately distinct equals() and isEqual() recursive invocations.
Disabling rascal-eclipse library extension point.

IDE brought up error messages from time to time, and it's not needed for measurements.
Extended logging options.
Bugfix: setting structural equality flag on hash table lookup.