Author: Damyon Wiese
MDL-64377 assign: Allow remove submission
Calls each submission plugin to remove the data for a submission.
http://git.moodle.org/gw?p=moodle.git;a=commit;h=37fc47f17d52485319cefb855a66c4ad44f192eb
http://github.com/moodle/moodle/commit/37fc47f17d52485319cefb855a66c4ad44f192eb
+ 3.7 en [batchoperationconfirmremovesubmission,mod_assign]
+ 3.7 en [eventremovesubmissionformviewed,mod_assign]
+ 3.7 en [removesubmission,mod_assign]
+ 3.7 en [removesubmissionforstudent,mod_assign]
+ 3.7 en [removesubmissionconfirm,mod_assign]
+ 3.7 en [removesubmissionconfirmforstudent,mod_assign]