fix bulk checking

Signed-off-by: semteacher <semteacher@gmail.com>
Cope with empty section names.
Moodle 2.6 compatibility fixes
Fix compatibility with Moodle 2.5 and below
Improve performance of checklist_get_participants
Merge branch 'master' into 01-checkmark_detail_info
Merge branch '01-checkmark_detail_info' into 02-support_osce_marks

Conflicts:
	locallib.php