Actually refactored the method names on these classes to come into
complete compliance with the code standards. Untested; maybe there are
some bad method names now.
darcs-hash:20081222201304-84dde-3effcce0f9ef25fbe0bfebd505037d9ff37252fa.gz
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
