#629470: Boost tags in html are now optional, can be set in http header; thus the document is not changed at all when it is cached.

#624026: Flush all sites caches in this database, works like it should now; at least I hope it does.

#620648: Have boost_stats.php file and menu item return a 404 if directly hit with no parameters. Also do a robots.txt warning for that link.