Author: Marina Glancy
MDL-60926 auth: do not map very long profile fields
http://git.moodle.org/gw?p=moodle.git;a=commit;h=3f79afbb782cc83d4e7db6b6afd4e878aba5a8d1
http://github.com/moodle/moodle/commit/3f79afbb782cc83d4e7db6b6afd4e878aba5a8d1
+ 3.3 en [cannotmapfield,core_auth]