This adds separate controls for the sending of notifications from the mod_assign.
The separate notifications are: student submission receipt (for students), feedback available (for students)
and submission updated (for graders). The grader notifications can be enabled for all submissions or just late ones.
Added code to reset the message providers on upgrade (only applies for a 2.3 dev version)
Thanks to Mary Cooch & Martin Dougiamas who contributed to this
rewording.
AMOS BEGIN
REM These module help texts are going to be displayed more prominently in the Moodle interface
AMOS END