Author: Petr Skoda
MDL-45219 add course recent_activity_viewed event
http://git.moodle.org/gw?p=moodle.git;a=commit;h=dce7ec41e996b1e3dc6e5d6ca65335acbb24466d
http://github.com/moodle/moodle/commit/dce7ec41e996b1e3dc6e5d6ca65335acbb24466d
+ 2.7 en [eventrecentactivityviewed,core]