Author: Sara Arjona
MDL-61952 gradeexport_xls: Implement privacy API
http://git.moodle.org/gw?p=moodle.git;a=commit;h=04051566249e8ae7fe915ef4a68d2e6bb685861b
http://github.com/moodle/moodle/commit/04051566249e8ae7fe915ef4a68d2e6bb685861b
+ 3.3 en [privacy:metadata,gradeexport_xls]