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changes in weave branch:
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* Remove RevisionReference class; Revision.parent_ids is now simply a
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list of their ids and parent_sha1s is a list of their corresponding
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sha1s (for old branches only at the moment.)
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* New method-object style interface for Commit() and Fetch().
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* Renamed Branch.last_patch() to Branch.last_revision(), since
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we call them revisions not patches.