Direct P2P connections between mobile devices are unlikely to work, and
they'd expose the social graph to surveillance.

Leaving the expiry date at 22 January until the fix is confirmed.

The new format is simpler but less efficient for small integers, short
strings and short byte arrays.

If the schema of the database is incompatible with the schema expected
by the code, the database throws a DbSchemaException. LifecycleManager
indicates the error to BriarService, which uses HomeScreenActivity to
show a notification and quit the app.

Note that some devices (I'm looking at you, Huawei U8110) misreport
connectivity by failing to set EXTRA_NO_CONNECTIVITY and returning true
from ConnectivityManager.getActiveNetworkInfo().isConnected() when
there's no connectivity.

The latest version of libevent (2.0.21-stable) works fine.

Fixes bug #7. The service is restarted after a crash even if
onStartCommand() returns START_NOT_STICKY, but after restarting the DB
key is not restored and so the app can't usefully proceed.

The distinction between inbox groups and other groups can be maintained
internally, there's no need to represent it on the wire.

This allows us to avoid instantiating the plugin on unsupported
architectures.