Author: evltuma
MDL-52490 assign: download selected assigment submissions as zip file
http://git.moodle.org/gw?p=moodle.git;a=commit;h=d0d8a2da8fe8fecbc5200bce3a59c0fa9851372d
http://github.com/moodle/moodle/commit/d0d8a2da8fe8fecbc5200bce3a59c0fa9851372d
+ 3.1 en [batchoperationconfirmdownloadselected,mod_assign]
+ 3.1 en [downloadselectedsubmissions,mod_assign]