add inverse option to ministat

[Poul-Henning Kamp]

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In message <20150715002013.GZ8523 at funkthat.com>, John-Mark Gurney writes:

>Instead of having to massage the data, or know that below a certain
>percentage you can just flip the sign, provide this, and you'll now
>convert to x per second, giving you an easier comparision for talking.

Why isn't this fundamentally against the UNIX and Software Tools Philosphy
and the first step on a long road to turn ministat into R ?

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