Developer credits
Git commits in Moodle x.x.x by Ngo Nghia
commit 5a8d683fb2403876e0b22b89ad7636f1ee8cdc4f Author: Ngo Nghia <ngonghiahp93@gmail.com> Date: Tue, 20 Dec 2016 08:44:17 +0800 Tag: v3.5.0-beta MDL-25617 backup: backup/restore using extra_question_fields