How to move a mailing-list $LISTNAME from sources to gcc.gnu.org

Note that if you're changing the list's name as well then you have to do more work. And, worse, this isn't currently documented.
  1. Support both addresses, $LISTNAME@sourceware.org and $LISTNAME@gcc.gnu.org. Some of this you have to do as users ``alias'' or ``listarch''.
  2. mv /www/sourceware/ml/$LISTNAME /www/gcc/ml
  3. chgrp -R gcc /www/gcc/ml/$LISTNAME
  4. Edit /www/gcc/ml/$LISTNAME/$LISTNAME.mrc, specifically LIST-ADDRESS.
  5. Optional: Add a redirection to httpd.conf and restart httpd.