Author: Jerome Mouneyrac
MDL-29805 add REQUIRE_CORRECT_ACCESS define + return error code when AJAX_SCRIPT fails
http://git.moodle.org/gw?p=moodle.git;a=commit;h=a8c99982fbd49927088fdbb319492def1280ff4d
http://github.com/moodle/moodle/commit/a8c99982fbd49927088fdbb319492def1280ff4d
+ 2.2 en [requirecorrectaccess,core_error]