Expanding forum auto-cleaning

If your thread was deleted and you believe it shouldn't have been, please PM me so I can take a look into why it was flagged. Edit: I suspect I may have gotten something backwards. Please PM mods to have the thread undeleted, and I'll fix it before tomorrow's purge. Edit 2: In fixing the bug I've decided to make a change to it: now edits in any post of the thread are counted, not just the first post.