[MERGE] refactor of find_previous_heads from inventory to repository

[Robert Collins]

On Fri, 2007-06-29 at 01:15 -0400, Aaron Bentley wrote:
> 
> Seems like it would also be nice to implement find_heads on Graph?  It
> would also be nice to avoid get_ancestry, since it scales with the
> size
> of ancestry.

Indeed.

-Rob
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