Author: Tim Hunt
MDL-20636 Reveiw all throw statements.
http://git.moodle.org/gw?p=moodle.git;a=commit;h=88f0eb15465095a81afb1501ecf796838a5ae3d8
http://github.com/moodle/moodle/commit/88f0eb15465095a81afb1501ecf796838a5ae3d8
+ 2.1dev en [errorsavingflags,core_question]