1807 - all tests passing again

Rendering the screen was easy to fix: I'd just never gotten around to
printing anything but spaces.

Rendering the 'screen:' was harder. Turned out I wasn't incrementing
row, and so the screen contents were overwriting the header. Much
fiddling with row ensued. Still unclear if I have a sane policy for
managing row. I don't leave cursor on start of next line after
render-string (relying on run-interactive to return strings terminated
by newlines) but I do so in render-screen.

Never mind, all architecture is illusion and all programs sit on the
edge of chaos. This is just the best way I know how to permit others to
periodically reclaim architecture from chaos by expending energy. But
it'll never be perfect.

Crash-only architecture for the win.

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