[PATCH 1 of 6] dirstate: rename dirs to iterdirs, and return only dir names

[Bryan O'Sullivan]

On Thu, Mar 28, 2013 at 6:22 PM, Bryan O'Sullivan <bos at serpentine.com>wrote:

> The refcounts that we maintain behind the scenes are not public, so make
> sure we don't expose them to callers (who don't care anyway).
>

After some further code inspection (thanks to Siddharth), it turns out that
context.changectx has an almost identical need to compute a bunch of dirs.

To accommodate that cleanly, I'm going to rework this patchset a little.
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