Author: Damyon Wiese
MDL-37459 admin: Admin settings flags
Make "Advanced" and "Lockable" flags for any admin setting.
http://git.moodle.org/gw?p=moodle.git;a=commit;h=3c88a67821c5afab4e8fbf75da25dee11047708a
http://github.com/moodle/moodle/commit/3c88a67821c5afab4e8fbf75da25dee11047708a
+ 2.6 en [enabled,core_admin]
+ 2.6 en [locked,core_admin]