Author: John Beedell
MDL-62708 question: Add idnumbers to question and question category
http://git.moodle.org/gw?p=moodle.git;a=commit;h=6189fda47ffefba8255dfff16c68d1a8528f3532
http://github.com/moodle/moodle/commit/6189fda47ffefba8255dfff16c68d1a8528f3532
+ 3.6 en [idnumber,core_question]
+ 3.6 en [idnumber_help,core_question]