[Bug-zile] Alien buffers progress

[Reuben Thomas]

Update: I have a very first cut of alien buffers working.
Unfortunately, it shows up the fact that alien buffers are
(conveniently) 1-based, whereas I'm assuming 0-based counting (carried
over from the C days). Rather than do impedance-matching, as I do in
the naive string-based buffer implementation, it seems more sensible
to make everything 1-based, to remove all the impedance matching and
reduce the potential for future bugs.

Unfortunately, doing the right thing here, as so often, will be a bit of a pain.

I'll proceed by reverting to the naive string-based buffers, changing
them to zero-based, changing all the calls, and going from there.
Sigh.

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