- fallback to SIM card before phone locale
- add disabled code to lookup the country from GPS, disabled because it requires a network call

- this will be useful later for e.g. auto-disabling Tor

There's currently no way to set this setting, so the bug isn't fixed.

Fixes bug #42.

Of course, not all devices support Bluetooth...

This follows the principle of least surprise: the default identity
doesn't change when a new identity is created.