[OE-4103] - accomplished date migration
[OE-4103] - showing accomplished date in episodes_sidebar if specified
[OE-4103] - small change to EventTest.php + modify fixtures to include accomplished data and up-to-date columns
[OE-4103] - changed episode sidebar order display to consider accomplished date
[OE-4103] - fix for accomplished_date in version table,
-implemented beforeSave behaviour to make sure accomplished_date is set to a default created_date if not set otherwise
[OE-4103] - added code to show Event->accomplished_date before open Elements are rendered
[OE-4103] -  Event->accomplished_date can be set on create or by admins only
[OE-4103] -  Event->accomplished_date events now show icon in episode sidebar
Merge branch 'develop' into jira/OE-4103
[OE-4103] -  Checked in icon and fixed accomplished vs created date check
Merge branch 'jira/OE-4103' into develop