Implemented simple group sorted using numerical ordering
See role.py for some example usages.
Note that the reason ToS does not appear seperately is due to the
fact that it is defined as a regular field which does not take the
group field from the one defined in the model.
Patch by: Sverre Rabbelier
Typo fix in seed_db module which caused loaded organization applications not to work correctly (wrong keyname).
Patch by: Pawel Solyga
Reviewed by: to-be-reviewed