Created message.css, moved most message related css there, updated message look,...

Created message.css, moved most message related css there, updated message look, they now have round-corners and dropshadow.
Message header looks cleaner now, maybe we need to talk about proportions of username, date and edit buttons.
Corrected #content starting position (streamlined it with yesterdays banner shortening).
Added a little space between navbar/banner and actual content at the top.
Moved morepromt style to content.css, adapted moreprompt colors.
Removed unneeded stuff from iconbar which i added for testing reasons yesterday.
Removed an empty line from navbar.css

Sorry for the huge commit, I did it in the wrong way, edited message stuff first and later did the rest...
Other way around would make cherry picking simpler, but I think it looks damn good now. ;)
Checked with Opera11 and FF3.6, looks and works consistent.
IE6 login seems broken (at least with iexplorer running in wine...)