[RFC] walkdirs skip api

[Robert Collins]

Hi,
	I've figured out what I think is a reasonable API for skipping dirs
with walkdirs.

Currently we do a del on the dirblock to remove things we dont want to
iterate over. This is somewhat expensive, and very expensive when we try
to stack walkdirs - as we do in WorkingTree.walkdirs (we stack walking a
RevisionTree and the osutils.walkdirs together to show
versioned/unversioned file state etc).

I propose the following:
walkdirs() will return a Walker object which has two methods:
walk()
skip(basename)

walk() will return the current generator
skip(basename) will schedule basename to be skipped when next() is
invoked on the generator.

How does that sounds ?

-Rob


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