Git commits in Moodle 3.4.4 by Tobias Reischmann

commit 708dca3400730f6c7c74170585c49101268a6245
Author: Tobias Reischmann <tobias.reischmann@wi.uni-muenster.de>
Date:   Wed, 23 May 2018 20:05:28 +0800
Tag:    v3.4.4

MDL-62543 forum: Switched the usage of the deleted flag for rss