[MERGE] --usage option

[Ian Clatworthy]

Jelmer Vernooij wrote:
> Jelmer Vernooij has voted abstain.
> Status is now: Semi-approved
> Comment:
> It seems more sensible to me to have a --usage and --help option, as so
> many other applications (including all popt based apps) do.

Done in the attached patch.

Ian C.
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