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 2.3.4.2
HOSSUP-2124 Remove assignments from the grade_me block once they
have all been graded
Updated release to 2.3.4.3
HOSSUP-2237: Fix SQL to support PostgresSQL
HOSSUP-2425 Fixed mod/assign functionality and added unit tests and test data
HOSSUP-2588 - Updated release to 2.3.4.4
HOSSUP-1425 Updated upgrade.php and install.xml to replace field
"itemid" for table block_grade_me with the new field "id"
HOSSUP-1628 Removed unnecessary plugin->dependencies line from version.php
HOSSUP-2582 - Fixed several image urls to use Moodle pix notation.
HOSSUP-2752 - Updated release to 2.3.4.5
HOSSUP-2910 - Updating version to 2012080506 because of upgrade.php error.