Author: Tim Hunt
MDL-74752 qtype_match: implement regrading hooks
As much as they can be before MDL-5560 is addressed.
http://git.moodle.org/gw?p=moodle.git;a=commit;h=cc262124db413d75439c4933b233bba04aef405c
http://github.com/moodle/moodle/commit/cc262124db413d75439c4933b233bba04aef405c
+ 4.0 en [regradeissuenumchoiceschanged,qtype_match]
+ 4.0 en [regradeissuenumstemschanged,qtype_match]