Java Packages are identified only by their Last Namespace Element during propagation to UML

[SofiaAnanieva]

When propagating Java packages to UML, different packages with the same suffix (e.g., aroguml.org.util and argo.util) are considered as the same package and thus incorrectly merged during propagation. Consequently, elements being contained in the Java package that is propagated second are placed in the Java package that was propagated first.

A possible solution would be to adapt the Java2UML-Reactions in order to match packages based on their full namspace (i.e., fully qualified name).

[HeikoKlare]

Should probably be fixed together with #178.