Author: Tim Hunt
MDL-67947 questions: questions_in_use should ask all components
Previously it was only checking mods.
http://git.moodle.org/gw?p=moodle.git;a=commit;h=7bde84a7053e76408400c9718ec812698d206fe3
http://github.com/moodle/moodle/commit/7bde84a7053e76408400c9718ec812698d206fe3
+ 3.8 en [questionsinuse,core_question]