Calendar

My first attempt at a pull request. Adding in Calendar v4 stuff;
- some bug fixes
- Added https as a transfer method (requires a manual install of Perl Crypt::SSLeay)
- Added a 'control calendar'. Events with the name of an item will be turned on at event start, and off at event end.
- Slightly modified web/organizer/calendar.pl so that any calendars marked as control don't show in the web view.