#1 Admin tool to manage user groups

[Erik Karlsson]

Admin tool to manage user groups. This tool should be
able to add, modify and remove user groups. Tool
should also be able to add and remove user from
certain user group. The tool should also be able to
control who can create, remove and modify certain user
group.

The tool must allow the owner user and admin user to
edit the user group. In the begining only admin should
be able to create a user group.