[MERGE] Graph.heads()

[John Arbash Meinel]

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Robert Collins wrote:
> Robert Collins has voted resubmit.
> Status is now: Resubmit
> Comment:
> In packs we have a larger graph space.
> Rather than one graph per file, we have one graph for the repository,
> with pairs (file_id, revision_id) as keys.
> 
> It would be nice to cut a couple of layers out and work directly in that
> space. If not, then at least the repository should be able to do that
> itself and translate only the result - so I'd really prefer to see this
> functionality on repository.
> 

I'd also like to comment that since Graph already has the functionality
for computing heads (it needs it for the least common ancestor code), it
would be really good to at least expose it.

John
=:->

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