Git commits in Moodle 3.7.x by Martin Gauk

commit 8d21ca65d4b592980b7214e934879571de66af81
Author: Martin Gauk <gauk@math.tu-berlin.de>
Date:   Fri, 17 Jan 2020 20:13:41 +0800
Tag:    v3.7.6

MDL-51694 core_grades: use transactions when deleting


commit 9ccc9ec17515ed930df833ab32bd18d1c9968733
Author: Martin Gauk <gauk@math.tu-berlin.de>
Date:   Tue, 15 Oct 2019 23:03:33 +0800
Tag:    v3.7.3

MDL-66915 assign: Notify only if grade was updated in past 24 hours


commit 96c24a19125b7bca0eb1d9913570a3ca7f0dda38
Author: Martin Gauk <gauk@math.tu-berlin.de>
Date:   Mon, 08 Jul 2019 17:10:11 +0800
Tag:    v3.7.2

MDL-58026 question: fix regrading in progress attempt


commit 3e24d6f663d0d578a3ce02e91565238d7a0dc5cc
Author: Martin Gauk <gauk@math.tu-berlin.de>
Date:   Mon, 25 Feb 2019 19:13:32 +0800
Tag:    v3.7.0-beta

MDL-64941 qtype_multianswer: keep order of existing wrapped questions