! move sort title to context so the template can use it as well

Signed-off-by: Spuds <spuds@spudsdesign.com>
! message index icons to sprite
move last_post, message icons, quick moderation, sort, lock and sticky

Signed-off-by: Spuds <spuds@spudsdesign.com>
! css for the message index spriting

Signed-off-by: Spuds <spuds@spudsdesign.com>
! message index icon sprite

Signed-off-by: Spuds <spuds@spudsdesign.com>
! tweaked the width of the lock/sticky

Signed-off-by: Spuds <spuds@spudsdesign.com>
Merge pull request #1481 from Spuds/topicsprite

Message index sprite