Updated header at top and bottom of thread list.

Tweaked color of active thread in the thread list to match the color of the message header.

I think that's just about all that I am going to do for cosmetic tweaks to the forum.

The main things left that I am going to mess with are the "Start" page (the one that says "Welcome to the MoI forum" on the right-hand side when you first enter the forum, I may be able to put some useful stuff over here), and also trying to get the forum indexed by Google better.

- Michael