[MERGE] Shelf 5 / 5

[Aaron Bentley]

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Hi all,

Here, at last, is the default shelf UI, with tests and everything.

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.

Aaron
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