Author: Paul Nicholls
MDL-42190 workshop: Add "sumbission_deleted" event
Add (and trigger) an event for deletion of submissions, so that deletions
are logged.
http://git.moodle.org/gw?p=moodle.git;a=commit;h=30c52da9be6ef43b05807e2074e74fb675906e89
http://github.com/moodle/moodle/commit/30c52da9be6ef43b05807e2074e74fb675906e89
+ 3.1 en [eventsubmissiondeleted,mod_workshop]