V 0.3 (NOT RELEASED YET)
    - PEP: presence and +notify initial support
    - PEP: notifications for auto subscribers
    - added "presence" access model
    - implemented affiliations
    - items are now ordered by default using last update date. This is actually the order corresponding to the XEP
    - item creation and modification are now saved in 2 separate fields
    - "roster" access model has been renamed to "publisher-roster"
    - re-implemented feature which allows an entity to retract an item from somebody else node (i.e. a node from which he is neither owner or publisher) if he is the publisher of the item.
    - implemented "Order-By" protoXEP
    - node schema experimental features (use a data form as a schema for a node)
    - serial ids experimental feature (ids in series like 1, 2, 3, etc.)
    - pubsub admin experimental feature (publish item and specify the publisher, only for admin users)
    - SàT Pubsub can now be configured using the same config file as SàT itself, i.e. "sat.conf"
    - new "admins_jids_list" setting, to specify a comma separated list of admin bare jids.
    - admins can delete node, change schema, change config or delete items even if they are not owner of a node
    - MAM: filtering by categories
    - MAM and RSM various improvments
    - replaced sat.tmp by new independent sat_tmp module, so now SàT Pubsub can be used independently of SàT
    - item id is returned on publish if it is not provided already
    - (bug fix) fixed security check which was rejecting all delegations from external servers
    - (bug fix) fixed publisher check on item publishing
    - various other fixes/improvments, checks the mercurial logs for details

v 0.2 (02/12/2015):
    - schema updated (unversioned => version 1)
    - sync with Idavoll
    - use of sat.tmp.wokkel as a workaround for change not merged upstream
    - RSM (XEP-0059) implementation
    - MAM (XEP-0313) implementation
    - Namespace Delegation (XEP-0355) implementation
    - Privileged Entity (XEP-0356) implementation
    - removed remote-roster hack
    - SàT PubSub can be used as a PEP service (PEP implementation not complete yet)
    - item publisher is enforced
    - categories handling (not complete)
    - pgsql: schema version is checked, and a message asking to upgrade is displayed if needed

v 0.1.1 (09/09/2014):
    bugfix release

v 0.1.0 (24/02/2014):
    ** FIRST PUBLIC RELEASE **