Author: Mark Nelson
MDL-40063 mod_quiz: replaced 'addcategory' add_to_log call with an event
http://git.moodle.org/gw?p=moodle.git;a=commit;h=58940b190acf16d45618d6e6dbc44e1596af2d3d
http://github.com/moodle/moodle/commit/58940b190acf16d45618d6e6dbc44e1596af2d3d
+ 2.7 en [eventquestioncategorycreated,core_question]