Author: Eric Merrill
MDL-53167 search: Add ability to limit courses searched
http://git.moodle.org/gw?p=moodle.git;a=commit;h=427e3cbcd689cb112df8aff7836e580f25e4f0cb
http://github.com/moodle/moodle/commit/427e3cbcd689cb112df8aff7836e580f25e4f0cb
+ 3.1 en [allcourses,core_search]