Remove Chrome workaround in Unread.update() function.
Up min Chrome version.
Re-think the Quote Backlink implementation.

Before this rewrite, containers and backlinks were created even if the relevant
post did not exist in the page. If the post would never end up existing, it
resulted in a waste of resources. QuoteBacklink's cache also prevented these
containers and backlinks from being garbage collected.
We now only store a map of fullIDs. This feature should be faster since less
elements gets allocated, although the difference is probably negligible.
Simplify QuoteMarkers.parseQuotelink arguments.
Fix incorrect OP/cross-thread markers on some backlinks.
Fix quote markers on backlinks in clones.
Hide the .page-num in archived posts.
warosu archives /biz/.
Also add /d/ to foolz beta.
Close #1455.
Add some default booleans to Posts and Threads.
Remove timeOfDeath as I won't get to use it anytime soon.
Fix #1456.
Update deps.
Fix the QR.