Author: Ferran Recio
MDL-69143 contentbank: add import file method to content
http://git.moodle.org/gw?p=moodle.git;a=commit;h=c6ec3c048ed9cf6beb3d0cbccb90e5d033047d1f
http://github.com/moodle/moodle/commit/c6ec3c048ed9cf6beb3d0cbccb90e5d033047d1f
+ 3.9 en [errornofile,core_contentbank]