Git commits in Moodle 3.7.0 by Andreas Wagner

commit d5ef685249feaef38613f4b5eb041af8e68ffb09
Author: Andreas Wagner <awagner@gmx.de>
Date:   Sun, 18 Nov 2018 23:34:05 +0800
Tag:    v3.7.0-beta

MDL-60972 core_course: delete section files, when section is deleted.