CORE-636 List of attributes for each type in AD

Admin dashboard is now working.

I updated the original migration so the DB will need to be reset. I'll handle this on appengine (there seem to be migrations missing anyway), @reciprocitylaran let me know if you need help doing it locally.
I think we should actually remove ListViewController from the code completely, but this would require some changes to TreeViewController, so we keep putting it off.