Implement new messages class
Support legacy $_SESSION['message_*']
New function messages::add($message, $mood, $delay) to simplify adding messages
updated core/users/user_edit.php to demonstrate
includes space->tab corrections
Fix for $mod_li and $mod_a_li not being blanked/reset foreach menu
parent item rendered, causing the first menu with sub items to force sub
item rendering for all remaining menu items