Author: Rajesh Taneja
MDL-40919 mod_survey: replaced add_to_log with events
http://git.moodle.org/gw?p=moodle.git;a=commit;h=9e176aa2f5a885d4d08804eada81aed0ec73a883
http://github.com/moodle/moodle/commit/9e176aa2f5a885d4d08804eada81aed0ec73a883
+ 2.7 en [eventreportdownloaded,mod_survey]
+ 2.7 en [eventreportviewed,mod_survey]
+ 2.7 en [eventresponsesubmitted,mod_survey]