This should enable us to connect to contacts faster at startup and
whenever a new means of connecting becomes available.

The LAN plugin only accepts IPv4 link-local or site-local addresses.
This rules out LANs that use globally routable addresses (such as UCL),
but also reduces the chances of the LAN plugin making observable
connections across the WAN, which could reveal the social graph.

Both plugins will attempt to reuse the previous address and port only if
there's currently an interface with that address; this will avoid
unnecessary attempts to bind to nonexistent addresses.

Of course, not all devices support Bluetooth...

This allows the oldest LocalAuthor to be used as the default.

This adds complexity but will save a lot of bandwidth, as most of the
strings and byte arrays we want to send are less than 128 bytes.

The extra complexity isn't exposed outside of the serial component.

Dev task #52. Known but unverified identities are also supported, but
currently unused. These will be used in future for contacts who've been
introduced but not verified face to face.

- add a UnixRemovableDriveMonitor.checkEnabled to pre-emptively check if it's loaded
- os.arch is always x86,x86_64 on windows, i386,amd64 on linux
- source: http://www.java-gaming.org/index.php/topic,14110
- we'll deal with freebsd support when we come to it, jnotify doesn't even do this atm

This way the tests won't show up as having run if they didn't.

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

Note that this is only the generator part of Fortuna, not the
accumulator. The generator requires a seed, which is provided by a
platform-specific implementation of SeedProvider. On Linux the
implementation reads the seed from /dev/urandom.

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.

Also fixed a bug in addGroup(): SELECT COUNT (NULL) doesn't work.

Offered and requested message IDs are stored in the database rather than
being owned by DuplexConnections. This paves the way for moving to a
simplex transport layer.

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