Git commits in Moodle 3.7.x by Stefan Topfstedt

commit a9c3e2f95ed691cd56b5f728823e61c23b32472e
Author: Stefan Topfstedt <Stefan.Topfstedt@ucsf.edu>
Date:   Wed, 19 Jun 2019 06:21:22 +0800
Tag:    v3.7.3

MDL-66433 block_myoverview: tag courses as "hidden from students"