DNS(): Cache NXDOMAIN
Performance: Only purge old antispam hashes once per request (at most)
Bugfix: Corrupt images were not getting removed from /tmp (convert, gm, and gifsicle)
Add `ip` index to post tables for faster ?/IP/ (and flood detection, etc.)
Sitemap theme: Minimum time between generating, and only generate on post-thread and post-delete
Performance: Add `expires` index to antispm table to make purging old hashes a little quicker
Allow Unix sockets for database connection
Huge bugfix: Old tracked cites where not being purged correctly. Recommend query: "TRUNCATE TABLE `cites`;" to start over
Merge remote-tracking branch 'upstream/master'