Geom class project idea - geom_cow

[Poul-Henning Kamp]

In message <ygfpsek95qk.fsf at dominion.borderworlds.dk>, Christian Laursen writes
:
>I have an idea for a geom class that I think could be useful in a number
>of scenarios.
>
>The basic idea is that it takes two existing providers and uses the first
>one as a starting point and the other one to keep changes to the first
>one using copy-on-write.

This one has been one of the inspirations for GEOMs generality from
the very beginning, but so far nobody has actually written it.

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