[MERGE] Make {BzrDir,Repository}.find_branches a generator.

[John Arbash Meinel]

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Andrew Bennetts wrote:
| This patch simply changes BzrDir.find_branches and Repository.find_branches to
| be generators, rather than functions that return lists.  This allows the callers
| to get incremental results.
|
| I did this because I use “bzr merged-branches” (from
| https://launchpad.net/bzr-removable).  This patch makes that command feel much
| faster, because it starts giving output much much sooner.
|
| -Andrew.

I think it would be nice if the api was such that it *could* be a generator, and
that the smart version would just use a list to implement it. Because I agree
with Robert that you don't want Network code around a generator (which may not
be consumed, failures at odd times, etc), but when you have 50 branches on disk,
it is nice to start working once you find the first one.

So...

BB:tweak

John
=:->
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