Author: Tim Hunt
MDL-74752 qtype_multichoice: fix regrading logic
The implements the new regrade-related hooks, and also has
tests for the changes to the core system, now that we have a question
type we can use for them.
http://git.moodle.org/gw?p=moodle.git;a=commit;h=5ad18a4070bbb8cd7d6db020990492804ccdc53f
http://github.com/moodle/moodle/commit/5ad18a4070bbb8cd7d6db020990492804ccdc53f
+ 4.0 en [regradeissuenumchoiceschanged,qtype_multichoice]