Major Description
[This is a GSoC 2008 task]
The biggest complaint about the ObjRelationship mapping dialog is that it is often unclear how it operates, especially to the new users. I.e. empty list of DbRelationships is displayed as a white area, not giving any hints on what needs to be done to map a relationship. So that's confusing. Same thing when you add 1 path component, there is no hint that you can chain more path components for the flattened relationship.
At the minimum we may just add some hint text ("Select next DbRelationship" in grey over the next available dropdown), but ideally we should implement a path browser, similar to how the SelectQuery prefetch and ordering browsers operate (and similar to how OS X Finder does).