Change name and definition of k_surf (now ksurfC)   compute also ksurfW,ksurfS (for NonLin-FreeSurf)
Change name and definition of k_surf (now ksurfC)
  compute also ksurfW,ksurfS (for NonLin-FreeSurf)

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