Git commits in Moodle 3.5.5 by Neill Magill

commit cd05eba738326dd8b030eea79dfba9c9dddbdc79
Author: Neill Magill <neill.magill@nottingham.ac.uk>
Date:   Thu, 09 Aug 2018 17:28:21 +0800
Tag:    v3.5.5

MDL-63103 filebrowser: Speed up finding activities with files