Updated runtime model.
Adjusted the generation of the Java classes for the model so that it is
possible to easily extend the generated classes using inheritance.
The model is prepared to be augmented by extending the EMF generated
classes. E.g. by overriding convertXXX method for serialization of
java.lang.Method (when needed for the serialization needed with JPF).
Merge branch 'newgen' of https://github.com/d3scomp/JDEECo.git into newgen