Author: David Woloszyn
MDL-52046 cohorts: Add ability to bulk delete cohorts
http://git.moodle.org/gw?p=moodle.git;a=commit;h=b174d05b54c812f346bfd84971a1c115db8438f0
http://github.com/moodle/moodle/commit/b174d05b54c812f346bfd84971a1c115db8438f0
+ 4.5 en [delcohortsconfirm,core_cohort]