Logger: Support separate log files, buffer log lines.
Hook up better to dan's tests.
Mpfd: read() on closed fd triggers null.
Vrclient: Better detection of exited client.
We really really need unique UIDs.

We didn't get them because multiple clients started at the same
time.
Whoopsy
Nits
Fix timeouts.

In socketland (particularly Unix-socket-land), we can connect to a socket,
which dies, and never hear back that it is actually dead.
Json: Fix shameful error in array_data().

Since array_data() returns mutable data, it must uniqueify.
Json: Fix move ctor.

We require that all null Jsons have zero complex pointer.
Detect failed connection attempts very early.