~bzr-pqm/bzr/bzr.dev

1311 by Martin Pool
- remove RevisionReference; just hold parent ids directly
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changes in weave branch:
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1313 by Martin Pool
- rename to Revision.parent_ids to avoid confusion with old usage
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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.)
1388 by Martin Pool
- update NEWS files
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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.
1393.1.5 by Martin Pool
- move copy_branch into bzrlib.clone
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1393.1.11 by Martin Pool
- copy_branch creates destination if it doesn't exist
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 * Move copy_branch to bzrlib.clone.copy_branch.  The destination
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   directory is created if it doesn't exist.
1393.1.59 by Martin Pool
- put 'format=5' on inventory and revision xml
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 * Inventories now identify the files which were present by 
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   giving the revision *of that file*.
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 * Inventory and Revision XML contains a version identifier.  
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   This must be consistent with the overall branch version
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   but allows for more flexibility in future upgrades.