[MERGE] Shelf 1 / 5: TreeTransform serialization

[Aaron Bentley]

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Robert Collins wrote:
>> This patch implements TreeTransform serialization so that we can
>> reconstruct a preview tree for unshelving purposes.

> Just a design question: where do these get stored

.bzr/checkout/shelf

> (could/should they go in a repository?)

I think they could go in, but they're better out.
- - shelves are closely associated with a working tree.
- - unshelving changes removes them from the shelf, releasing filesystem
  space.
- - current repositories don't have namespaces, so it would be inelegant.

Aaron
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