Author: Peter
MDL-33671 core: Add ability to download selected items
Utilise the new checkbox-toggleall functionality
http://git.moodle.org/gw?p=moodle.git;a=commit;h=a216d86c6c6a390a0d517b860285663dc260055b
http://github.com/moodle/moodle/commit/a216d86c6c6a390a0d517b860285663dc260055b
+ 3.9 en [downloadselected,core_repository]