VCML diff: diff should ignore some re-orderings

[GoogleCodeExporter]

Some re-orderings of parts of VC objects should be ignored. E.g., the
ordering of the different multi-language descriptions is irrelevant, also
the ordering of constraints in a dependency net is irrelevant. For some
permutations, e.g., in the ordering of the cstics of a class, there should
be some VClipse preference to enable/disable ignoring the permutation.

Original issue reported on code.google.com by tg@webxcerpt.com on 10 May 2010 at 12:15