[merge] push and pull to use Result objects

[Aaron Bentley]

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Martin Pool wrote:
> This changes them to instead return a Result object with various fields.
>  This is also passed to the relevant hooks, which simplifies their
> interface.  (This is not a compatibility problem because those hooks
> were added in this release.)

I don't see a difference between PushResult and PullResult.  Do you
think a difference is justified?

Also, I agree with John that it would be nice if all the members were
defined in the class definition-- otherwise, reuse is kind of hard,
because you never know whether you've set all the right properties in
the object.

Aaron
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