netcalc update: it's 2019 after all

After receiving a request from Martin on the misc@ mailing list to make IPv6 the default version for netcalc, I decided to implement my original idea of dynamically detecting which version IP address the user supplies so that no switch is necessary to discern the two. It was a trivial change but definitely an improvement; and, like Martin remarked, "it's 2019 after all." Despite the fact that IPv4 still traffics most of the Internet with approximately 75% coverage, any encouragement to implement its successor should be the default position.

I am a little surprised that IPv6 wasn't the default being taught at …

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