[MERGE] Multiple element keys.

[Robert Collins]

On Fri, 2007-07-27 at 22:50 +1000, Robert Collins wrote:
> This adds the ability to do a GraphIndex with keys like (FILEID,
> REVISION), which is a key element that I need to complete the
> elimination of .kndx files in the experimental repository format, and
> will make the first round of repository refactoring feature complete.
> 
> Its essentially two changes:
>  - index keys go from bytestrings to tuples of bytestrings
>  - add a iter_entries_prefix method to GraphIndex indices allowing for
> the equivalent of 'iter_all_entries' for one FILEID using the above
> mapping.

I missed one concrete class. Doh. Attached an updated patch.

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