Author: Dmitrii Metelkin
MDL-62869 search: implement searching for all courses
http://git.moodle.org/gw?p=moodle.git;a=commit;h=2085e8603aff933269d8fcb8a5f8f6fcbd4537a4
http://github.com/moodle/moodle/commit/2085e8603aff933269d8fcb8a5f8f6fcbd4537a4
+ 3.7 en [searchablecourses,core_admin]
+ 3.7 en [searchallavailablecoursesdesc,core_admin]
+ 3.7 en [searchincludeallcourses,core_admin]
+ 3.7 en [searchincludeallcourses_desc,core_admin]
+ 3.7 en [mycoursesonly,core_search]
+ 3.7 en [search:course,core_search]