Author: Tim Hunt
MDL-20636 work-in-progress converting the ddwtos and gapselect qtypes.
http://git.moodle.org/gw?p=moodle.git;a=commit;h=c3e6bd18f5dadf15b505a5761c8713d05daadc78
http://github.com/moodle/moodle/commit/c3e6bd18f5dadf15b505a5761c8713d05daadc78