Remove positional arguments to dump and restore

[Jameson Graef Rollins]

On Fri, Aug 03 2012, david at tethera.net wrote:
> The positional argument to dump was deprecated quite a while ago. For
> restore, we never formally deprecated it. It seems a bit more
> consistent this way, but I don't mind leaving restore alone if people
> feel strongly about it.

LGTM.

jamie.
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