Author: Mark Nelson
MDL-42932 core_calendar: introduced calendar type system setting
http://git.moodle.org/gw?p=moodle.git;a=commit;h=bb32a499e10abc3bb88e715fb0575e5b7fb66e8e
http://github.com/moodle/moodle/commit/bb32a499e10abc3bb88e715fb0575e5b7fb66e8e
+ 2.7 en [calendartype,core_admin]
+ 2.7 en [configcalendartype,core_admin]