fix some errors in sitemaps
fix some errors in sitemaps

Only show notices that don't have a remote URL. That should include
only local notices.

Also, don't do an avatar sitemap; apparently nobody indexes these
anyways.

darcs-hash:20080812011600-84dde-680d39ef8379605febd16ed52c529711e8e1ccc9.gz

frankmullenger/centralflirt,frankmullenger/centralflirt,frankmullenger/centralflirt