Author: Issam Taboubi
MDL-51513 tool_lp: Properly delete a competency
http://git.moodle.org/gw?p=moodle.git;a=commit;h=9a325eda06e04d8e94e1982096d1d05525f22260
http://github.com/moodle/moodle/commit/9a325eda06e04d8e94e1982096d1d05525f22260
+ 3.1 en [competencycannotbedeleted,tool_lp]