point to icepack consortium master

[DeniseWorthen]

NOAA-EMC CICE currently points to an EMC fork of Icepack because the non-benchmark IC for the current coupled regression tests would abort at this section of icepack/columnphysics/icepack_therm_itd.F90.

              write(warnstr,*) subname, &
                 'ITD Thermodynamics: hicen_init(n+1) <= hicen_init(n)'
              call icepack_warnings_add(warnstr)
              call icepack_warnings_setabort(.true.)

NOAA-EMC has maintained a version with icepack_warnings_setabort(.false.) to prevent the code aborting on the first timestep.

Testing of the new IC as part of ufs-weather-model PR #765 has shown this flag is no longer required to be set .false. to prevent failures on the initial timestep.

The flag should be set to true, because that will indicate that this specific condition is causing the model to abort.