Signal handling take 2, use zmq_poll in main thread

Signal handling now uses an inproc transport to send a message to the main
thread instead of acting on SIGINT and other termination signals and using
a global variable to signal alarm expiration (yuck).

This also changes the main/receiver thread architecture which now uses
zmq_poll() and gives us the additional advantage of being able to poll for
GUI events regularly. This solves the problem of the receive mode UI freezing
when the sender has gone away.

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