New aggregation model for groups. No more nested or overlapping groups!
New aggregation model for groups. No more nested or overlapping groups!

git-svn-id: 6d8cdd4af04c6f63acdc5840a680025514bef303@2086 4f21837e-9f06-0410-ae49-bac5c3a7b9b6

egonw/pathvisio,egonw/pathvisio,egonw/pathvisio,egonw/pathvisio,egonw/pathvisio