[RFC] merge - common_ancestor generation

[Aaron Bentley]

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Robert Collins wrote:
| I'd like to alter common_ancestor generation via changing combined_graph
| to use the weave prelude of each repository rather than reading the
| revision files: except in the presence of ghosts the information will be
| identical with the proposed consistency check I've put forward in my
| reconcile branch.

And when ghosts are present, common_ancestor ignores them.  So +1 from
me, I guess.


| Also, we should delete old_common_ancestor I think.

Sure.

Aaron
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