Author: David Mudrák
MDL-69772 admin: Better validation for the allcountrycodes setting
The patch introduces a new admin_setting fiela type that can be used for
specifying comma separated list of countries. The field has inbuilt
validation so that only valid country codes can be inserted.
http://git.moodle.org/gw?p=moodle.git;a=commit;h=659e5282a45d96e3df47484e8e094d9900258e4c
http://github.com/moodle/moodle/commit/659e5282a45d96e3df47484e8e094d9900258e4c
+ 4.0 en [invalidcountrycode,core_error]