Author: Damyon Wiese
MDL-43985 Assign: Allow teachers to skip notifying students about grade update.
Backport of MDL-33600
Conflicts:
mod/assign/locallib.php
http://git.moodle.org/gw?p=moodle.git;a=commit;h=f9323c70d6a7289d325163e18f552732219447e7
http://github.com/moodle/moodle/commit/f9323c70d6a7289d325163e18f552732219447e7
+ 2.5 en [sendstudentnotifications,mod_assign]
+ 2.5 en [sendstudentnotifications_help,mod_assign]