[rfc] removing LockableFiles

[Aaron Bentley]

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Martin Pool wrote:
> So I propose to change things so that Branch, WorkingTree, Repository
> components just have a _transport and a _lock, and then to delete this
> class.

Seems okay to me.  It will mean enhancing some classes to take over
functionality from LockableFiles, e.g. setting permissions.

If control_files goes away, TreeTransform will need a new strategy for
interacting with limbo.

I suppose one option would be for WorkingTree to provide a get_transform
method.  That would allow WorkingTree implementations to supply
different TreeTransform implementations.  I'm thinking of MemoryTree and
a potential RemoteTree.

That may be a YAGNI at this point.  For one thing, WorkingTree could
just provide get_limbo_path.

Aaron
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