miscellany: Few more working things

Changed the headers in the mail and interdepartmental message code- now the sender and recipient usernames are linked to the user lookup, and the departments are linked to the departmental directories.

Also did a bit of a jumbly date conversion. Getting the year to go 27474 years ahead of the current year took a little bit of reading. But now messages show the proper date in game.

Still should add the date code to forums. And then it's a matter of going through the existing botcode to retrofit some of the new features into it. Report and mission code will end up just being worded a bit differently, and having different permissions set on the mission boards. If I bother doing a general comments/questions board, it'll be guest accessible.

Then, there's the slim possibility of incorporating some sort of user log. Have to see.