Author: Tim Hunt
MDL-20636 qtype_numerical Fix a bunch of minor issues found by Pierre.
http://git.moodle.org/gw?p=moodle.git;a=commit;h=ae3e2e6e7f49f1de7c1ac3e4ebf245f792bc73e5
http://github.com/moodle/moodle/commit/ae3e2e6e7f49f1de7c1ac3e4ebf245f792bc73e5