Git commits in Moodle 3.9.x by Matt Clarkson

commit eeba9c1dc59aaebe2234f53d8aa1f3ffc9c16cb4
Author: Matt Clarkson <mattc@catalyst.net.nz>
Date:   Fri, 23 Oct 2020 11:06:36 +0800
Tag:    v3.9.3

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


commit ae9e1f1888d7bc179322e6c3ba0632fce0446c16
Author: Matt Clarkson <mattc@catalyst.net.nz>
Date:   Wed, 08 Jul 2020 07:13:26 +0800
Tag:    v3.9.2

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