Author: ferran
MDL-85597 course: add selection to activity chooser
http://git.moodle.org/gw?p=moodle.git;a=commit;h=f54d7eefcd4869071cd6ca47a2b8ad96cfc07e48
http://github.com/moodle/moodle/commit/f54d7eefcd4869071cd6ca47a2b8ad96cfc07e48
+ 5.1 en [addselectedactivity,core_course]