Register data filters in a localrepo instead of util - Changing data filters implementation is easier, adddatafilter() can rewrap filter after inspecting their prototype - Custom data filters really belongs to localrepo, mixing them with generic wrapper like "pipefilter" or "tempfilter" looks wrong. - util.filtertable should not be accessed from extensions

hgweb: forgot to centralize the req.write() calls in hgwebdir

hgweb: centralize req.write() calls