Git commits in Moodle 3.6.x by Andrew Madden

commit fab4db099462f4a0c95bb6fbcedf9e52cd0ef5c7
Author: Andrew Madden <andrew.madden@live.com.au>
Date:   Thu, 04 Jul 2019 09:49:46 +0800
Tag:    v3.6.6

MDL-66032 badges: Prevent empty awarded badges criteria being created.

commit 87bcae7a573c7b30af81b0f4f8ef0cde50eb68f1
Author: Andrew Madden <andrew.madden@live.com.au>
Date:   Tue, 18 Jun 2019 09:58:31 +0800
Tag:    v3.6.6

MDL-65926 moodlelib: Convert username to lowercase prior to SQL query