o pkg/thsice: rename run-time parameters:    himin       -> hIceMin    himin0      -> hThinIce    hihig       -> hThickIce    i0          -> i0swFrac    transCoef   -> bMeltCoef    frac_energy -> fracMelting   add new parameters: hNewIceMax, fracFreezing, dhSnowLin    with default values (for now) that do not change the results.   remove old version of thsice vars advection in pkg/seaicer.
o pkg/thsice: rename run-time parameters:
   himin       -> hIceMin
   himin0      -> hThinIce
   hihig       -> hThickIce
   i0          -> i0swFrac
   transCoef   -> bMeltCoef
   frac_energy -> fracMelting
  add new parameters: hNewIceMax, fracFreezing, dhSnowLin
   with default values (for now) that do not change the results.
  remove old version of thsice vars advection in pkg/seaicer.

altMITgcm/MITgcm66h,altMITgcm/MITgcm66h,altMITgcm/MITgcm66h,altMITgcm/MITgcm66h,altMITgcm/MITgcm66h,altMITgcm/MITgcm66h,altMITgcm/MITgcm66h,altMITgcm/MITgcm66h