Tau mass constant has incorrect relative uncertainty

[evgaster]

I noticed in src/constants.cc that the calculation for the relative uncertainty for the Tau mass uses the Muon values in stead of the Tau values:

    // *Tau mass - Measurement
    "mτ",       "[ 1.90754_u "
                "  0.00013_u "
                "  'ROUND(UBASE(Ⓢmμ/Ⓒmμ);-2)' ]",

This is clearly incorrect.

[Wiljea]

That's true. Corrected in the future version of constants.cc.