Author: Petr Skoda
MDL-45219 add report_viewed event to report_questioninstances
http://git.moodle.org/gw?p=moodle.git;a=commit;h=f40d61c187c247348763e3086767fa3db54ae674
http://github.com/moodle/moodle/commit/f40d61c187c247348763e3086767fa3db54ae674
+ 2.7 en [eventreportviewed,report_questioninstances]