Git commits in Moodle 3.8.x by Matt Clarkson

commit 4ac4c9a6c933e794328012a172c339852eca04d6
Author: Matt Clarkson <mattc@catalyst.net.nz>
Date:   Fri, 23 Oct 2020 11:06:36 +0800
Tag:    v3.8.6

MDL-68722 atto_equation: fix for form elements with special characters


commit 63b646acb17f01af81447fe07e10b660f9a9f91a
Author: Matt Clarkson <mattc@catalyst.net.nz>
Date:   Wed, 08 Jul 2020 07:13:26 +0800
Tag:    v3.8.5

MDL-67440 analytics: optimse delete's in clean up task.