update gauge settings in TOV example to be more typical

[Roland Haas]

The current gauge setting in the TOV example match what was used in the ET paper so that one produces the same plot. However that choice is somewhat unusual:

ML_BSSN::harmonicN           = 1      # these set:
ML_BSSN::harmonicF           = 1.0    # dot[alpha] = - alpha A
ML_BSSN::evolveA             = 1      # dot[A] = dot[trK]
ML_BSSN::evolveB             = 1      # these set: dot[beta] = dot[dot[beta]] = 0
ML_BSSN::ShiftGammaCoeff     = 0.0    # by choosing coeffs to zero the RHS
ML_BSSN::AlphaDriver         = 0.0
ML_BSSN::BetaDriver          = 0.0
ML_BSSN::advectLapse         = 0
ML_BSSN::advectShift         = 0

and it may make more sense to use settings that are closer to BNS setup so that they can be generalized eg:

ML_BSSN::harmonicN           = 1      # 1+log
ML_BSSN::harmonicF           = 2.0    # 1+log
ML_BSSN::ShiftGammaCoeff     = 0.75
ML_BSSN::AlphaDriver         = 0.0
ML_BSSN::BetaDriver          = 1.0
ML_BSSN::LapseAdvectionCoeff = 1.0
ML_BSSN::ShiftAdvectionCoeff = 1.0

‌

[Roland Haas]

hackathon (update parfile, run and update gallery example page).