CommonObject handles attributes

Lots o refactoring this afternoon and evening. CommonObject now handles attributes and role, whereas before there were 3 different ways attributes were handled. I've tested everything at least once, but not with all the changes. Tomorrow I'll test more carefully and then do the releases.

The code changes will be quite helpful when queries are revamped. But at this point I need to review the new code base. Should display/xPress/XmlBinder work with both persistent objects and the DRM? I'm thinking no at this point, which means that I'll soon write some binder code for the DRM.