Author: Amaia Anabitarte
MDL-69672 core_contentbank: Check used context level
http://git.moodle.org/gw?p=moodle.git;a=commit;h=08687a5198e2486f962aa41b55551335bbe2dbed
http://github.com/moodle/moodle/commit/08687a5198e2486f962aa41b55551335bbe2dbed
+ 4.0 en [contextnotallowed,core_contentbank]