[MERGE] Shelf 4 / 5: ShelfManager

[Aaron Bentley]

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Hi all,

This patch implements ShelfMananger, which manages the stack of changes
on a shelf.  Shelved changes are stored in numbered files, like:
.bzr/checkout/shelf/4

The stack is ordered from lowest to highest, so 5 is popped before 4.
When a new entry is added, it's given the highest number + 1.

Aaron
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