Author: Mark Nelson
MDL-41101 mod_assign: replaced 'view submission' add_to_log call with an event
http://git.moodle.org/gw?p=moodle.git;a=commit;h=1be7aef2b1dc093c1133538ba2c69e568cb8825f
http://github.com/moodle/moodle/commit/1be7aef2b1dc093c1133538ba2c69e568cb8825f
+ 2.7 en [eventsubmissionviewed,mod_assign]