Hacked from bin/sync_members

Copy mailman/contrib/sitemapgen to mailman/bin/ and execute it as so:

  /path/to/mailman/bin/sitemapgen -l <listname>

Alternatively add it to cron like so:

5 0 * * *  for l in `/path/to/mailman/bin/list_lists -apb`; do 
		/path/to/mailman/bin/sitemapgen $l; done