First cut of mailman support.

First cut of mailman support.

- New list queries that add mailman and mailman_server arguments.

- Don't let non-dbadmin set mailman bit on a list (this will go away
  when the second tier of features is added).

- Add two arguments to end of incremental argv for benefit of
  mailman.incr.

- Make sure the magic mailman administrative lists (foo-admin,
  foo-request, foo-admin) are treated as reserved if the mailman list
  foo exists.