f8a5a149b7
reference counting thing, we can't rely on a user's object being destroyed immediately after they log off. Better to ensure that their location will always be cleared so that location interested entities will be properly notified. git-svn-id: svn+ssh://src.earth.threerings.net/narya/trunk@1991 542714f4-19e9-0310-aa3c-eee0fc999fb1