Author: Tim Hunt
MDL-20636 More work on the opaque question type. You can now set up question engines.
More work still needed on the actual question type.
http://git.moodle.org/gw?p=moodle.git;a=commit;h=3404cc149db02fc88f76e73cbe0e8d83cd10c5b3
http://github.com/moodle/moodle/commit/3404cc149db02fc88f76e73cbe0e8d83cd10c5b3