[MERGE] repository docs (cleaner still) and GraphIndex

[Robert Collins]

On Sat, 2007-07-14 at 01:09 +1000, Robert Collins wrote:
> This merge adds the repository docs writeup, with the index stuff I had
> in it cleaned up and the generic parts factored out to a new developer
> text file. 
> 
> I've also added a GraphIndex - a graph aware index which is 20% smaller
> than our knit indices today (at least for me on my repositories).
> 
> I plan to work on hooking this up to knits now, but I think the
> interface is sufficient for the time being, and I think its pretty clean
> and amenable to layering on top of/parallel implementations.
> 
> These things are quite closely related - the index api pressure comes
> from repositories needs, which is why I put them in the same branch.

This update changes the API to be more convenient for using in a bulk
manner - it makes missing keys not raise, which is analogous to SQL.

-Rob
-- 
GPG key available at: <http://www.robertcollins.net/keys.txt>.
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