Git commits in Moodle 3.6.x by Arto Nieminen

commit a63a6643e5ea3ee45951f42666a0d9f42a318c8e
Author: Arto Nieminen <arto.nieminen@mediamaisteri.com>
Date:   Fri, 07 Jun 2019 15:27:47 +0800
Tag:    v3.6.5

MDL-53778 quiz settings: Ensure that disabled checkboxes have value 0