Make Element.connect/disconnect/notify no longer needed for associations to work. Associations are now implicitly bi-directional. If not defined, a stub object will be created.
Make Element.connect/disconnect/notify no longer needed for associations to work. Associations are now implicitly bi-directional. If not defined, a stub object will be created.

git-svn-id: 80d932a80928324f4d3d71af042e652e41ead033@2119 a8418922-720d-0410-834f-a69b97ada669

amolenaar/gaphor,amolenaar/gaphor