- fix changelog,
 - fix knowbase items comments styles,
 - fix missing "itemtype" value for existing ticketfollowup elements,
 - fix detection of fields in migration,
 - fix bigdump generation,
 - use 'getFormURLWithID' instead of contatenating id with 'getFormURL'
 - factorize deletion of linked followups,
 - factorize 'canApprove',
 - factorize followups in notifications,
 - fixes some docblock,
 - remove dead code,
 - put back TicketFollowup to handle deprecation state
 - remove dead code
 - add ITILFollowup in API
 - Handle followups in notifications