[RFC] make push a separate method on Branch

[Robert Collins]

We have push currently implemented via pull(), because its largely
symmetrical. I wanted to write a hook today that would be for push only,
but couldn't because of this. One way in which push and pull are not
symmetrical is in performance: in push, the source branch is always
local, and thus fast, and in pull, the target branch is always local and
thus fast.

So I think we should have explicit push and pull methods on branch,
which may share a common worker function - I'll look at that when doing
the split.

Thoughts ?

-Rob
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