Issue #236: make repo group and user group owners editable (or get rid of them) (conservancy/kallithea)

[Dominik Ruf]

New issue 236: make repo group and user group owners editable (or get rid of them)
https://bitbucket.org/conservancy/kallithea/issues/236/make-repo-group-and-user-group-owners

Dominik Ruf:

Currently the owners of repo groups and user groups are not changeable (even though the repo owners are).

I think this should be changed.

A case where this bit me was:
I tried to delete an old user but he was still the owner of a repo group.
I could not change the owner of the repo group so I had to delete it.