[MERGE/RFC] MultiWalker

[Ian Clatworthy]

John Arbash Meinel wrote:
> Now with patch attached.
> 
> John Arbash Meinel wrote:
> | To make progress towards updating merge to handle criss-cross a bit
> | better, I've written a helper class.

bb:tweak

> +        :param master_tree: All trees will be 'slaved' to the master_tree. Such
> +            that nodes in master_tree will be used as 'first-pass' sync points.

No need for multiple sentences here ...

  "the master_tree such that ..."

> +        dirname, basename = os.path.split(path)

Should you be using osutils.split instead here?

Ian C.