[MERGE] faster iter_changes

[Robert Collins]

On Mon, 2008-09-22 at 19:21 -0400, John Arbash Meinel wrote:


> ^- Shouldn't this be moved into _dirstate_helpers_py.py ?
> 
> Similarly for:
> +class ProcessEntryPython(object):

I tried to do this; and the answer is 'its hard to do'.

There are (for performance reasons) cached default parameters that
become circular imports (lazy import doesn't work here). Its possible
that we can fix this up in future but its not a minor effort to fix.

-Rob
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