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=2a912052bc577504cd8338c31b2844387d831c06
http://github.com/moodle/moodle/commit/2a912052bc577504cd8338c31b2844387d831c06
+ 3.7 en [questionsinuse,core_question]