Author: Fred Woolard
MDL-42069 mod_quiz add lastname sort for manual grading
http://git.moodle.org/gw?p=moodle.git;a=commit;h=72b266d54e8abb96ff9f7783a07f6c8c9c93c57e
http://github.com/moodle/moodle/commit/72b266d54e8abb96ff9f7783a07f6c8c9c93c57e
+ 2.4 en [bystudentfirstname,quiz_grading]
+ 2.4 en [bystudentlastname,quiz_grading]
- 2.4 en [bystudentname,quiz_grading]