Author: Mark Nelson
MDL-42932 core_calendar: introduced calendar type system setting
http://git.moodle.org/gw?p=moodle.git;a=commit;h=8bf0f20795b8ccf535e14de975045b1ae8508eff
http://github.com/moodle/moodle/commit/8bf0f20795b8ccf535e14de975045b1ae8508eff
+ 2.7 en [calendartype,core_admin]
+ 2.7 en [calendartype_desc,core_admin]