Author: Frederic Massart
MDL-40055 mod_assign: Replace add_to_log 'revert submission to draft'
http://git.moodle.org/gw?p=moodle.git;a=commit;h=159b7f4024a924e554e4dec1482458915dda5125
http://github.com/moodle/moodle/commit/159b7f4024a924e554e4dec1482458915dda5125
+ 2.6 en [event_submission_status_updated,mod_assign]