[MERGE] pull --overwrite for bundles

[Aaron Bentley]

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Hi all,

This patch fixes overwrite so that it works for bundles.  Pull
- --overwrite had previously assumed that the source branch would have a
revision_history that ended with the stop_revision.  This is incorrect
even for pulling branches, but behaves especially poorly with bundles,
because it causes the branch to set its revision history to its *own*
revision history, i.e. a no-op.

Aaron
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