Author: David Monllao
MDL-51603 quiz statistics: Using dataformats selector
http://git.moodle.org/gw?p=moodle.git;a=commit;h=bc3b5a6a2f3818d32238a9e631f0b7b19ed2300f
http://github.com/moodle/moodle/commit/bc3b5a6a2f3818d32238a9e631f0b7b19ed2300f
+ 3.1 en [downloadeverything,quiz_statistics]