Git commits in Moodle 3.6.6 by Mark Nelson

commit 0b7e375d32a4bd2d421e01cb8130075bf012732d
Author: Mark Nelson <mdjnelson@gmail.com>
Date:   Tue, 09 Jul 2019 09:14:15 +0800
Tag:    v3.6.6

MDL-56835 report_participation: remove unreachable if condition


commit 4a8da9b005e33bd08ca905e1566d7a39bed0b1d6
Author: Mark Nelson <mdjnelson@gmail.com>
Date:   Wed, 26 Jun 2019 14:06:12 +0800
Tag:    v3.6.6

MDL-56835 report_participation: initialise action variables


commit c241a52e1225b48395a1f06b58741220dcdd7d32
Author: Mark Nelson <mdjnelson@gmail.com>
Date:   Tue, 25 Jun 2019 20:15:20 +0800
Tag:    v3.6.6

MDL-56835 report_participation: use course timecreated as minlog