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(jam) Merge 2.3 into 2.4 including the get_parent_map tweak.

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doc/en/release-notes/bzr-2.3.txt
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.. Improvements to existing commands, especially improved performance 
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   or memory usage, or better results.
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* Tweak an RPC implementation for ``Repository.get_parent_map``, it was
 
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  doing an inefficient ``small_set.difference_update(large_set)`` when we
 
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  can do ``small_set = small_set.difference(large_set)``. This speeds up
 
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  discovery time by about 10%. (John Arbash Meinel)
 
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Bug Fixes
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*********
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