Git commits in Moodle 3.1.3 by Tim Hunt

commit e7d8a6079b6adc04660d525e7261154205b00785
Author: Tim Hunt <T.J.Hunt@open.ac.uk>
Date:   Fri, 30 Sep 2016 00:23:27 +0800
Tag:    v3.1.3

MDL-56198 assignment: improve grading info responsiveness


commit 493f5d4851de5fbd29262143396943cb33437978
Author: Tim Hunt <T.J.Hunt@open.ac.uk>
Date:   Wed, 28 Sep 2016 01:07:50 +0800
Tag:    v3.1.3

MDL-56136 restore: better error handling copying file at start


commit 2a229e74a318d7a914464808a9cd3b855959d012
Author: Tim Hunt <T.J.Hunt@open.ac.uk>
Date:   Tue, 27 Sep 2016 02:46:22 +0800
Tag:    v3.1.3

MDL-53744 question file access: fix access checks


commit d7a5bef2d69fe8adba3acb98dec7aca62f4060ae
Author: Tim Hunt <T.J.Hunt@open.ac.uk>
Date:   Tue, 27 Sep 2016 01:28:35 +0800
Tag:    v3.1.3

MDL-56069 quiz: nav buttons don't scroll to the right question