[MERGE] --usage option

[John Arbash Meinel]

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Ian Clatworthy wrote:
> 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.
> 

BB:approve

It would be nice to land this early, so we get a chance to see if we
like it before a release.

John
=:->

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