Closed threads link good to go, but a couple items needed

Ok, so, I'd like you to do a few things on this:

1. Hide the "closed threads" link when already viewing it
2. include a link back to the open threads while viewing the closed threads
3. change the comment_count that is shown on links (such as at /w/pagename next to the discussion link) that tell you how many comments there are: make the normal one only count comments from open topics (exclude closed and retracted), add a new comment_count next to the "closed threads" link that counts *only* the comments in closed topics.

By the way, just so you notice for future reference, see where I fixed the areq vs areq' stuff for Bootstrap 3.