Group owners are regular users that can add or remove users to a group
The Admin UX allows admins to appoint group owners
The public group UX will display group owners first and unlock UI to
add and remove members
Group owners can only be appointed on non automatic groups
Group owners may not appoint another group owner
When adding a new group, if Delete was clicked before saving the
group, the modal would come up, but the Yes confirmation would
do nothing. This fixes that by taking an approach similar to the
Badges and checks to see if the Group is new, and if it is, just
returns to the index instead of invoking the confirm modal.
This also fixes the redirect after saving a new Group.
