[PATCH] baz2bzr: direct_merges performance bugfix

[David Allouche]

Attached is patch that rewrites the direct_merges function used by
baz2bzr to
      * avoid unneeded network round-trips (by a avoiding using "baz
        ancestry-graph --immediate" unless absolutely needed)
      * not rely on the New-Patches header of continuation revisions,
        which have been historically unreliable
      * incidentally fix the explosive memory usage problem
      * use set operations instead of list operations
      * use pybaz Patchlog.new_merges feature instead of reimplementing
        it

I _think_ it is as correct as possible, but I might have missed some
obscure aspect of the problem.
-- 
                                                            -- ddaa

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