Author: Frederic Massart
MDL-53719 competency: Delete content upon course and cm delete/reset
http://git.moodle.org/gw?p=moodle.git;a=commit;h=56537316f603ff8d60e57d5dc48ee88a44f21900
http://github.com/moodle/moodle/commit/56537316f603ff8d60e57d5dc48ee88a44f21900
+ 3.1 en [deletecompetencyratings,competency]