Git commits in Moodle 3.3.4 by Tim Hunt

commit 1926647e85f585d38b12fb2dd207d401c34c4af3
Author: Tim Hunt <T.J.Hunt@open.ac.uk>
Date:   Fri, 22 Dec 2017 21:35:29 +0800
Tag:    v3.3.4

MDL-61107 quiz editing: handle invalid Maximum grade input


commit e15be87a98513be2a1073404f872def0ed52cef6
Author: Tim Hunt <T.J.Hunt@open.ac.uk>
Date:   Fri, 15 Dec 2017 21:11:57 +0800
Tag:    v3.3.4

MDL-61045 quiz settings: add back missing disabledIf


commit b9ab4a82e56022645f0b2655f1f04e12f486a4f6
Author: Tim Hunt <T.J.Hunt@open.ac.uk>
Date:   Wed, 08 Nov 2017 22:30:27 +0800
Tag:    v3.3.4

MDL-60741 purgecaches: did not correctly setup the admin page