Fix: "Undefined variable: post" when viewing a forum's RSS feed
Reduce amount of data fetch per post
Cache per thread page post -> thread mapping where possible.
With Enhanced Search Improvements - Word Count 1.0.8, support for disabling the extra join when fetching posts.
Restore behaviour of rendering full thread+post link when a user has permission to see it.
Ensure pre-parsing runs on contents of a [post] or [thread] bbcode.
On the non-cached code path, do not query for a post twice.