User administration

OK, this will obviously only be necessary in the case where LDAP isn't used. Users are in one table, groups are in another, and the user-group link is a third. A click on a group should show the users in that group (this will be a double frame but I'm skipping that for now.)
Groups Users
System administrators
System user administrators

(Add a group)
Joe User
Jim-Bob Employee
Michael Roberts
Anonymous Web Access

(Add a user to group)