Author: Sam Hemelryk
MDL-28967 navigation: Several navigation fixes
* Fixed implementation of navigation settings navshowcategories, navshowallcourses, and navcourselimit
* Improved performance associated with loading all, or a collection of courses
* Fixed duplicate calls to loading functions when we had the information required to know it had already occurred
http://git.moodle.org/gw?p=moodle.git;a=commit;h=8e8de15f6c685aed59017e51a7fcc146076a721b
http://github.com/moodle/moodle/commit/8e8de15f6c685aed59017e51a7fcc146076a721b
+ 2.3 en [confignavshowallcourses,core_admin]