Author: Safat
MDL-76704 core_course: Add settings to control selected provider
http://git.moodle.org/gw?p=moodle.git;a=commit;h=f7b2f362181f30bbefb6de6ce68ad8c6abe253d3
http://github.com/moodle/moodle/commit/f7b2f362181f30bbefb6de6ce68ad8c6abe253d3
+ 4.3 en [coursecommunication_desc,core_course]