Author: Andrew Davis (andyjdavis)
MDL-27920 gradebook: export was always excluding course totals and xml export was failing
http://git.moodle.org/gw?p=moodle.git;a=commit;h=7ce5df86202093c84c5f8ebb24b0539e66261aa7
http://github.com/moodle/moodle/commit/7ce5df86202093c84c5f8ebb24b0539e66261aa7
+ 2.1 en [useridnumberwarning,gradeexport_xml]