[MERGE] New 'development' format.

[Aaron Bentley]

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Robert Collins wrote:
> I don't want the overhead of three experimental versions, subtree and
> rich-roots can be pulled between (as long as a subtree hasn't been
> used), and anyhow we should be looking at making rich-roots a default
> soon.

Yeah, development and development-subtree are the extremes of
functionality, with rich-root in the middle.  So rich-root probably
doesn't need as much direct testing.

I presume we could make "development" a rich-root format if we decide to
make rich roots the default.

Aaron
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