Author: Petr Skoda
MDL-30929 detect incorrect major version upgrades
http://git.moodle.org/gw?p=moodle.git;a=commit;h=9008ec16547cb0919507b5ab5a6aa07d7fc93287
http://github.com/moodle/moodle/commit/9008ec16547cb0919507b5ab5a6aa07d7fc93287
+ 2.3 en [upgradestalefiles,core_admin]
+ 2.3 en [upgradestalefilesinfo,core_admin]