Zone board extract

These are the boards, scraped on 2018-02-18, minutes before the shutdown.

Conversion notes:
* Character encoding: tried UTF-8, then windows-1252.
* The modified time of each file is set to the date of the last post.
* We're missing the last page of the Kingdom of Loathing thread (11008).
* Topic 22024 was edited to fix an HTML error that prevented it from parsing properly.
