Git commits in Moodle 3.9.0 by Martin Hanusch

commit 398f0ae11066873da80e4e421d44f3270a7e6524
Author: Martin Hanusch <martin.hanusch@let.ethz.ch>
Date:   Tue, 02 Jun 2020 22:50:02 +0800
Tag:    v3.9.0-beta

MDL-68772 mod_quiz: Navigation overlay fix

commit 08fe5349866d8e64bc903a677eb1be21314d4f1b
Author: Martin Hanusch <martin.hanusch@let.ethz.ch>
Date:   Fri, 29 May 2020 22:42:04 +0800
Tag:    v3.9.0-beta

MDL-63284 question: Moving questions with tags disabled bug fix