External calendar handeling

[kocjs]

Synchronizing an external calendar with curl -u 'user:myPassWord' -X PUT http://localhost:5232/user/calendars-colID04109/ --data-binary @calendar.ics as described in 98 makes it available in a local thunderbird lightning setup. However events do not get synchronized to other clients.

So far i was only able to import the calendar.ics manually to an existing calender in lightning.

Please add support for this.