[MERGE] Transport.get_directory is undefined

[Aaron Bentley]

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Robert Collins wrote:
> I've taken a stab at defining reliable behaviur for transport.get('a
> directory')

> +    * ``Transport.get`` has had its interface made more clear for ease of use.
> +      Retrieval of a directory must now fail with either 'PathError' at open
> +      time, or raise 'ReadError' on a read. (Robert Collins)

I don't understand how you can guarantee that for http.  In fact, I
don't see any changes to the http implementation.  And currently, the
branches plugin makes use of the fact that http servers often return an
index, so changing get to fail on directories would be a bit unhelpful.

Aaron
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