[MERGE] Change the smart server get_parents method to take a graph search to exclude already recieved parents from. This prevents history shortcuts causing huge numbers of duplicates.

[Aaron Bentley]

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Robert Collins wrote:
As for bzip2 - sure, but I didn't want to add a dependency
> that I didn't know if Windows has trivially available, and we already
> have a tried and tuned gzip implementation.

Bundle Format 4 uses bzip2.  If this were a Windows compatibility
problem, I think we'd know by now.

Aaron
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