Updating physical constants. #55
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We updated physical constants to values from PDG 2021. The previous constants were based on the PDG 2006 values. The change includes the redefinition of the SI system. Uncertainties on constants are given as a comment. Values that are not updated are: masses, binding energies and viscosity of atoms and molecules (as they are not given in PDG). Values for neutrino mass difference squared and coefficients of leptonic mixing matrix are not up-dated as well.
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The new build flag is called: `KConst_REFERENCE_EPOCH` Currently this has two values: `2006` and `2021` (default) For ease of maintenance, there are two corresponding header files that are now included from `KConst.h`.
- electron g-factor (was commented out before) - ionized tritium atom mass in kg (added digits) - Silicon atomic mass in g per mol (added digits)
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Further updates based on PDG 2021, and other up-to-date references.
For details, see original PR #54.