HOSSUP-1196 - Relocated applicable_formats() function per HOSSUP-1173
            - Added addinstance block capabilities in new db/access.php file
            - Added missing lang strings and PHPUnit test.
            - Made changes for new assignment table/columns.
            - Added back/documented M2.2 assignment plugin
            - Added login check, removed invalid db actions and cleaned up code.
            - Added upgrade step and incremented version
Updated version to 2.2.4.2
HOSSUP-2237: Fix SQL to support PostgresSQL
HOSSUP-2237: Stop cron method if no plugins are enabled.
HOSSUP-2588 - Updated release to 2.2.4.3
HOSSUP-2803 - Restored missing upgrade step
HOSSUP-2803 - Updated release to 2.2.4.4