Author: Sara Arjona
MDL-61952 gradeexport_xml: Implement privacy API
http://git.moodle.org/gw?p=moodle.git;a=commit;h=b9aa6148315a5a8b11ac943cf154bee6077fb331
http://github.com/moodle/moodle/commit/b9aa6148315a5a8b11ac943cf154bee6077fb331
+ 3.4 en [privacy:metadata,gradeexport_xml]