Author: Amaia Anabitarte
MDL-82478 core_coures: Add Delete option for subsection page
http://git.moodle.org/gw?p=moodle.git;a=commit;h=4fac40c02f721e76763c0814b8c8b6c8c0c39bd9
http://github.com/moodle/moodle/commit/4fac40c02f721e76763c0814b8c8b6c8c0c39bd9
+ 4.5 en [cmdelete_subsectiontitle,core_courseformat]