Author: Raymond Wijaya
MDL-34794: Add reset course feature in mod_assign (new assignment (2.3+))
http://git.moodle.org/gw?p=moodle.git;a=commit;h=d38dc52f39e50f5025d7948a309c386c5d3b2370
http://github.com/moodle/moodle/commit/d38dc52f39e50f5025d7948a309c386c5d3b2370
+ 2.4 en [deleteallsubmissions,mod_assign]