Author: Rajesh Taneja
MDL-40058 mod_wiki: Replaced add_to_log for page diff view with event
http://git.moodle.org/gw?p=moodle.git;a=commit;h=3e5e78a2c9b9209b4fae87bf9a1663d30095249a
http://github.com/moodle/moodle/commit/3e5e78a2c9b9209b4fae87bf9a1663d30095249a
+ 2.7 en [eventdiffviewed,mod_wiki]