Author: David Mudrák
MDL-59443 forms: Allow implicit validation of filetypes element values
The validation obeys the element options 'allowall', 'allowunknown' and
'onlytypes' passed when creating the element.
http://git.moodle.org/gw?p=moodle.git;a=commit;h=572d6fdef30625c0b6be73802b6aa88b764bf6e5
http://github.com/moodle/moodle/commit/572d6fdef30625c0b6be73802b6aa88b764bf6e5
+ 3.4 en [filetypesnotall,core_form]
+ 3.4 en [filetypesunknown,core_form]