Author: Sara Arjona
MDL-61952 gradeexport_xls: Implement privacy API
http://git.moodle.org/gw?p=moodle.git;a=commit;h=ed71c8b1df9825fbe3fe6d2f57a59329d0c9fa90
http://github.com/moodle/moodle/commit/ed71c8b1df9825fbe3fe6d2f57a59329d0c9fa90
+ 3.5 en [privacy:metadata,gradeexport_xls]