Add a MENU for every ExtensibleModel
Add a way (possibly a class attribute or something) in the ExtensibleModel class to add additional Links to a model view. This would be a way for other apps to link to data inside other app's views. (E.g. link the timetable and the week_view of a group to the group display site). There should be a way similar to the menu generator or the extensible part in extensible models, so there would be simply a dict-like object in every model instance, with links containing a text, an url, an icon and permissions as well