Author: Mark Nelson
MDL-40912 coursecat: replaced 'add' add_to_log call with an event
http://git.moodle.org/gw?p=moodle.git;a=commit;h=03ea10e6d3a42f3cff32d5065ffdb0b05b29fd52
http://github.com/moodle/moodle/commit/03ea10e6d3a42f3cff32d5065ffdb0b05b29fd52
+ 2.7 en [eventcoursecategorycreated,core]