Proper rmuser script. 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. Generally though, this is part of my trend to moving DB work from the web interface into the backend.