Author: Tim Hunt
MDL-20636 Conversion of the OU multi-response question type.
http://git.moodle.org/gw?p=moodle.git;a=commit;h=1c2ed7c501c59c40caa956b0f2a256457e9e7770
http://github.com/moodle/moodle/commit/1c2ed7c501c59c40caa956b0f2a256457e9e7770