PostGreSQL: schema update: access models changes: - renamed roster to publisher-roster, as roster is in fact the pubsub service's roster, so it was badly used - added whitelist, publish-only - new non standard (yet?) self-publisher. It is planed to allow publisher to publish, update and delete only its own items - roster => publisher-roster renaming, and whitelist has been added to item access model too. publish-only and self-publisher don't make sense for items added "member" to affiliations (will be used for whitelist) news tables item_jids_authorized and item_languages. updated to version 2