1315 - chessboard now working interactively

I tried to bring too much into this commit, and paid the price with some
debugging effort. Still havent't tried to enable line buffering, but
I'll take a snapshot.

Some tests are failing because of the huge hack in the scheduler.

For a while I thought there was a bug in termbox because I kept seeing
segfaults and valgrind complained about out-of-bounds access. But that
was just subsidiary threads trying to print to the screen after I'd
returned to console mode.

Maybe I should add a test for send-keys-to-channel. Or just use a fake
keyboard rather than a channel.

And *then* there's the fact that the interaction is molasses slow.
Slower than the arc version even though the tests run so much faster.
And what's with the long pauses in printing strings to screen?

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