Git commits in Moodle 3.10.4 by Neill Magill

commit e6725b8cbb2f9508070593b543abd765c7637422
Author: Neill Magill <neill.magill@nottingham.ac.uk>
Date:   Thu, 04 Apr 2019 18:33:31 +0800
Tag:    v3.10.4

MDL-64336 assign: Add missing PHP doc

commit bd80f68c11e78b46c2575bd52e10f70eba0d0148
Author: Neill Magill <neill.magill@nottingham.ac.uk>
Date:   Thu, 04 Apr 2019 18:31:49 +0800
Tag:    v3.10.4

MDL-64336 assign: Teachers should be able to see all submissions

commit dbcfda9641f6bd66c2d41425630978ba29c0076f
Author: Neill Magill <neill.magill@nottingham.ac.uk>
Date:   Mon, 10 Dec 2018 17:27:36 +0800
Tag:    v3.10.4

MDL-64336 assign: Submissions should be visible while frozen