The DB queries this uses aren't particularly efficient, and when the
time it takes to run starts to become a problem, we should do an
optimization pass.
This moves responsibility for the periodic prune-everything Timer up to
RelayServer too. That way we can be sure the stats are dumped
immediately after prune, and we can incorporate stats from Transit as
well.
The reasoning is that this string is only ever likely to refer to the
version of the primary/initial client (the CLI application, written in
Python, that you get with "pip install magic-wormhole"). When there are
other implementations, with unrelated versions, they should obviously
not pay attention to a warning about the other implementation being out
of date.
* add "released" ack-response for "release" command, to sync w.close()
* move websocket URL to root
* relayurl= should now be a "ws://" URL
* many tests pass (except for test_twisted, which will be removed, and
test_scripts)
* still moving integration tests from test_twisted to
test_wormhole.Wormholes
