Interim mods

System changes by RAB, 1/09
 * 1/2: Created /usr/local/cs with rights for wheel group on mist, castaway, helios.
 * 1/2: Created /usr/local/cs/etc/profile and added sourcing of that file at the end of /etc/profile, to support CS-related path, script, etc.

Mike
 * cs300 users added to new group "student"
 * set resource limits on users of group "student" via /etc/security/limits.conf