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=2558ce35931e342767da8c04340cd039a1ddb1f0
http://github.com/moodle/moodle/commit/2558ce35931e342767da8c04340cd039a1ddb1f0
+ 2.0 en [useridnumberwarning,gradeexport_xml]