Renamed setup_groups to a more descriptive name.

Took away the check that means group owners can't leave groups for a bit. The implementation of this will need revisiting.

* A more neutral colour scheme, appropriate for a default installation
* Forms are layed out with the title beside the inputs
* The profile page is in tabs
* Layout is cleaner and clearer
* Still will be some bugs, especially in IE!

add better messages for when there are no groups to display

used by mygroups and find