Added an inbox and outbox for direct messages. Factored common code to mailbox.php. Factored common code with stream.php to personal.php. darcs-hash:20080916195346-84dde-b5c846f713a970c41fd1b0671cb333e91f3cb920.gz
darcs-hash:20080916185126-84dde-2983718fc2ab11874c839489290b8a827985274d.gz