Author: Alexander Bias
MDL-61804 admin: Add setting for course visibility sorting
http://git.moodle.org/gw?p=moodle.git;a=commit;h=8471a0db4205dcfa4dc215331de05d0d32e09be7
http://github.com/moodle/moodle/commit/8471a0db4205dcfa4dc215331de05d0d32e09be7
+ 3.8 en [navsortmycourseshiddenlast,core_admin]
+ 3.8 en [navsortmycourseshiddenlast_help,core_admin]