New query-operators available

Two additional query-operators have been added to the rule-concept of EMFTrace.

ModelUndirectedRelatedTo - works just as the existing ModelRelatedTo-operator except for ignoring the directions of relations, which is especially useful for simplifying rules searching for equivalences. Instead of
<or>
<modelrelatedto source="e1" target="e2" value="Is-Equivalent-To">
<modelrelatedto source="e2" target="e1" value="Is-Equivalent-To">
</modelrelatedto></modelrelatedto></or>

you can now write the following, more simpler, query:
<modelundirectedrelatedto source="e1" target="e2" value="Is-Equivalent-To"></modelundirectedrelatedto>

ModelIndirectlyRelatedTo - searches for indirect relations between two models of a certain type. For example, you could use this operator to query the inheritance hierarchy of classes or call-relations between methods.