[MERGE] Add scan_unvalidated_index to _KnitGraphIndex, add external_refernces to GraphIndex and BTreeGraphIndex.

[Andrew Bennetts]

Ok, and this time with patch attached.  Third time's the charm!

I wrote:
> [I tried to send this yesterday, but screwed up my From address, and couldn't
> find it in the moderation queue.]
> 
> This patch adds a new API, scan_unvalidated_index, to _KnitGraphIndex.  This is
> intended for use by resume_write_group, so that a _KnitGraphIndex can
> reconstruct the list of missing compression parents that insert_record_stream
> would have built up if those records had been added in a single unresumed write
> group.
> 
> This partly replaces the patch that John voted bb:resubmit for, by keeping the
> state about missing compression parents in the _KnitGraphIndex rather than the
> KnitVersionedFiles.
> 
> It also adds an external_references method to GraphIndex/BTreeGraphIndex.
> 
> -Andrew.
> 
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