Sessions: fixed logout() destroying normal session (instead of elevated) if $level = USER_LEVEL_CHPREF. Possible very minor security concern: elevated sessions were not fully destroyed, so if a normal session is opened from the same IP, the elevated one may be reusable for 15 minutes.
ALTER TABLE {{TABLE_PREFIX}}session_keys ADD COLUMN key_type smallint NOT NULL DEFAULT 0;
UPDATE {{TABLE_PREFIX}}session_keys SET key_type = 2 WHERE auth_level > 2;
ALTER TABLE {{TABLE_PREFIX}}users ADD COLUMN user_dst varchar(11) NOT NULL DEFAULT '0;0;0;0;60';
ALTER TABLE {{TABLE_PREFIX}}users ADD COLUMN user_rank_userset smallint NOT NULL DEFAULT 0;