[PATCH] Simplify walk-entries code by not special-casing non-recursive case

The attached patch simplifies code that walks a WC, by always using the
"walk_entries" function, and no longer special-casing the single-file
(or non-recursive directory) cases. The "walk_entries" function can
handle those cases itself.

This patch is NOT FINISHED: two merge tests fail, presumably due to some
intentional difference between the single-item case and the recursive
cases. I'll investigate and fix if there are no objections.

Does anyone see a flaw in this approach?

Thanks,
- Julian

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