Duplicate operations when weaving Association concern

[Matthias Schoettle]

As reported by Jörg: When weaving certain features in the Association concern, duplicate operations are the result. For example, weaving HashMap results in all operations being duplicated (i.e., the partial and the concrete ones).

[Matthias Schoettle]

Resolves #281: Adds an OR clause to also check whether the existing references match in case the woven reference does not. In addition, the check for matching parameter names is removed.

→ <<cset 1b937bf3d2bd>>

[Matthias Schoettle]

This is still an issue, e.g., when weaving ArrayList, duplicate methods occur. It seems that this is due to the fact that the weaver does not correctly determine whether the parameter types are the same. One of the parameters refers to a type of another aspect.