Major reorg of deleteuser page. Dump the old rmacct-ctrl (finally!)
and replace with script to delete a user, either from a single project or from the entire testbed. All of the DB stuff is done in the script; the web interface no longer does anything but error checks. This is because removing a user requires some finess in when things are removed, and if there are any failures I wanted to make sure that the script could be rerun on a user, without barfing. Add lots of error checks to make sure not deleting a user who is "important" (project head, group head, experiment head, etc). Add "request" mode. If a project leader deletes a user from his project, and the user has no more project memberships, show a click button to send us email requesting the user be deleted from the testbed. Bottom line, project leaders can now delete users from their project, but must ask us to delete the account from the testbed.