Git commits in Moodle 3.7.6 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