[time-nuts] Modified Total Deviation calculation

[Poul-Henning Kamp]

In message <4B55AFE9.4040104 at febo.com>, John Ackermann N8UR writes:

>My only request is to code unobfuscatedly [...]

Well, there is a tendency for unobfuscated versions of these functions
to suffer from rounding errors, in particular when absolute timestamps
are used.

Please pay particular attention to this, as the rounding losses tend
to result in overly optimistic, but often almost plausible metrics.

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