[PATCH 01 of 11] copies: style fixes and add comment (issue4028)

[timeless]

> @@ -331,7 +331,8 @@
>      m2 = c2.manifest()
>      ma = ca.manifest()
>
> -    copy1, copy2, = {}, {}
> +    # see checkcopies documentation below for these dicts
> +    copy1, copy2 = {}, {}

I've been meaning to ask:
Do we know why this is a -1+2 instead of a -0+1 diff?
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://www.mercurial-scm.org/pipermail/mercurial-devel/attachments/20161005/aef4a6d3/attachment.html>