[MERGE] Shelf 5 / 5 for reals

[Aaron Bentley]

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Aaron Bentley wrote:
> Since shelving is a heavily-interactive process, I had to test a derived
> class of Shelver, ExpectShelver.  ExpectShelver does some basic
> scripting-- you tell it what prompt to expect, and how to reply.
> Prompts are processed in order of insertion.
> 
> Unshelver is simpler (for now!) because it doesn't allow changes to be
> selected.

Since no one has reviewed it thus far, here's an updated version of the
shelf UI.  Mainly I've added documentation, but I've also made the API
less bogus and fixed a bug shelving renamed and modified files.

Note that the outcome of the Emacs discussion was that these commands
are acceptably compatible with Emacs.

Aaron
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