Refactoring of Branch.rename_one

[Johan Rydberg]

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Hi,

What do you people think of moving out the some of the code from
Branch.rename_one to the UI (i.e., builtins.py).  My gut feeling tells
me that Branch.rename_one should only be an operation on the inventory
and not also on the working directory.  Also, this makes things a lot
harder for tools like ``tailor'', which actually does the rename
itself.  

It might be sufficient to just add a flag to rename_one that specifies
that the rename has already been done.

~j
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