[PEAK] Command-line option parsing

[Darryl]

> Hm.  That doesn't look too bad, especially since
> Set/Add/Append/option_handler are mostly trivial variants of each other,
> while Required and reject_inheritance just set some simple
> metadata.  Really, most of the complexity will be buried in the parsing,
> and in the assembling of a parser from the metadata.
> 

Yay, option parsing!

/me goes back to lurking....

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