Add Auto-Provisioning

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Either via URL (see http://dmfs.org/wiki/index.php?title=Auto-provisioning )
or via a prepared config file

Options
The dav url (seperate vor card/cal/task)
The user
The Password (hashed?)
The Server Cert (For self signed)

Of course the Privisioning shall allow combinations of above where the rest ist completed with the ui

Something like that is already in development for DAVdroid! This will greatly simplify the setup process. See #148 for more details.

Indeed, support for well-known URIs is coming, and support for current-user-principal is already available.