Including `nu` in `DphitEff` even though it is not present in (LUU:Eq. 17)
provided higher level of resemblance to benchmarks for the tests considered,
particularly for the peak skin friction (yet, pressure-related predictions
were unaffected). Users can switch off `nu` in `DphitEff` by using
`includeNu` entry in `kEpsilonPhitFCoeffs` in order to follow the
reference paper thereat. `includeNu` is left `true` by default.
See GitLab issue #1560,
LUU: Laurence, D. R., Uribe, J. C., & Utyuzhnikov, S. V. (2005).
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