Author: Mark Nelson
MDL-41101 mod_assign: replaced 'view feedback' add_to_log call with an event
http://git.moodle.org/gw?p=moodle.git;a=commit;h=3290c01dc5e0c1c7d281777f98967b94a065e13e
http://github.com/moodle/moodle/commit/3290c01dc5e0c1c7d281777f98967b94a065e13e
+ 2.7 en [eventfeedbackviewed,mod_assign]