Author: Tim Hunt
MDL-20636 Conversion of the shortanswer question type to the new question engine.
This commit includes minor bug fixes elsewhere in the system.
http://git.moodle.org/gw?p=moodle.git;a=commit;h=068b4594bafb765f900021018d32a09001e4f61f
http://github.com/moodle/moodle/commit/068b4594bafb765f900021018d32a09001e4f61f
+ 2.1 en [notenoughanswers,qtype_shortanswer]