Offline checkin & renewal checks, & ou settings

Offline checkin & renewal checks, & ou settings

Augmented edoceo's patch for checking an offline checkout against an item's
Status Changed Time and throwing a SKIP_ASSET_CHANGED event if warranted as
follows:

1) include checkin and renewal transactions
2) add org unit settings for each, and a corresponding upgrade script
3) removed the description from the payload and created a dedicated ils_event

However, there are two issues affecting this functionality, even before my
meddling:

1) the Reshelving -> Available rollover updates an item's Status Changed Time,
   and can thus trigger this event
2) if an item is manipulated more than once in an offline session, then its
   Status Changed Time can be updated as the transactions are being processed,
   causing related transactions after the initial transaction to fail

Signed-off-by: Jason Etheridge <jason@esilibrary.com>
Signed-off-by: Mike Rylander <mrylander@gmail.com>