Changed forum maintenance script to be slightly more efficient and to use user extended data for storing stuff instead of user profiles, so you no longer need a user profile to get new posts highlighted.

Added meficat's requested 24h panel toggle (it seems kinda... silly to me, but it only took ten seconds), cleaned up the Settings page a little, and added invisible mode for users. (It stops updating your user profile automatically and hides you from all "who's online" screens. People can still see your edits, obviously.)