Author: Ferran Recio
MDL-69143 contentbank: add import file method to content
http://git.moodle.org/gw?p=moodle.git;a=commit;h=3dfbd5a16f4c76e42758c4ed636b32535b4143fd
http://github.com/moodle/moodle/commit/3dfbd5a16f4c76e42758c4ed636b32535b4143fd
+ 4.0 en [errornofile,core_contentbank]