Git commits in Moodle 3.9.0 by Mark Johnson

commit f77212a051abb840f18ade50b91f8810509a5741
Author: Mark Johnson <mark.johnson@open.ac.uk>
Date:   Thu, 23 Apr 2020 22:55:03 +0800
Tag:    v3.9.0-beta

MDL-68503 user profile: Make sortorders relative to existing records

commit d62ce1d4198987e3c33e52c8aefb24100151b23b
Author: Mark Johnson <mark.johnson@open.ac.uk>
Date:   Tue, 14 Jan 2020 17:58:48 +0800
Tag:    v3.9.0-beta

MDL-67681 Cache: Store coursecattree array in a single key

commit 96e440493bd26290d62898141432e6143fe4e44b
Author: Mark Johnson <mark.johnson@open.ac.uk>
Date:   Mon, 13 Jan 2020 19:37:09 +0800
Tag:    v3.9.0-beta

MDL-67674 Cache: Lock rebuilding of the course category tree cache