Cleaning up Branch

[Aaron Bentley]

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Martin Pool wrote:
> Branch() has a lot of methods but it's not completely clear to me how
> to slice it up.  (Well, one thing would be to remove obsolete
> interfaces and move things that work on the working directory into an
> object representing it.)

Here's how I'd propose slicing things:
Branch
- - all operations that access or modoify revision-history and merge history
- - contains a Storage and a WorkingTree

WorkingTree
- - all inventory operations
- - pending merge api
- - file / directory / symlink create/write/read/delete operations

Storage
- - all revision and RevisionTree operations, except those that refer to
branch history
- - all access to inventories
- - all access to texts
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