rename SEAICE_VECTORIZE_LSR_ZEBRA to SEAICE_LSR_ZEBRA and add more comments
rename SEAICE_VECTORIZE_LSR_ZEBRA to SEAICE_LSR_ZEBRA and add more comments

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