[MERGE] Shelf 4 / 5: ShelfManager

[John Arbash Meinel]

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Aaron Bentley wrote:
> 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

BB:tweak

John
=:->
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