Sea level ponds second PR including Icepack

[apcraig]

PR checklist

• Short (1 sentence) summary of your PR:
  Sea level ponds second PR including Icepack
• Developer(s):
  apcraig, eclare
• Suggest PR reviewers from list in the column to the right.
• Please copy the PR test results link or provide a summary of testing completed below.
  Pre-merge testing, https://github.com/CICE-Consortium/Test-Results/wiki/cice_by_hash_forks#bf2aa3f4abce18d657724bb72dae86cf715fe963
  https://github.com/CICE-Consortium/Test-Results/wiki/icepack_by_hash_forks#f000063a5b35adcdaed4c569179a200456576d94
• How much do the PR code changes differ from the unmodified code?
  • bit for bit
  • different at roundoff level
  • more substantial
• Does this PR create or have dependencies on Icepack or any other models?
  • Yes
  • No
• Does this PR update the Icepack submodule? If so, the Icepack submodule must point to a hash on Icepack's main branch.
  • Yes
  • No
• Does this PR add any new test cases?
  • Yes sea level ponds, new history fields
  • No
• Is the documentation being updated? ("Documentation" includes information on the wiki or in the .rst files from doc/source/, which are used to create the online technical docs at https://readthedocs.org/projects/cice-consortium-cice/. A test build of the technical docs will be performed as part of the PR testing.)
  • Yes
  • No, does the documentation need to be updated at a later time?
    • Yes
    • No
• Please document the changes in detail, including why the changes are made. This will become part of the PR commit log.

Update Icepack to #4469e2e878e952bf6

Update CICE for sea level ponds
- fix allocate
- clean up CICE_InitMod.F90 in drivers
- update unittest code to be consistent with standalone cice
- remove call to icepack_init_sealvlpnd (was removed in Icepack)
- add new pond history fields to ice_in
- add new pond history fields to histall test option
- update pond history field names using dpnd_* convention
- turn off pond history "dpnd_" fields for topo ponds scheme, not yet validated
- update pond history field accum_hist_field calls using 1:ncat_hist

Updated drivers standalone/cice and nuopc/cmeps. Other drivers need to be updated.

Remove trailing blanks

Update code alignment

Update documentation

[apcraig]

I am running a final set of tests and waiting for github actions to complete. Also looking for a review and documentation check if possible. Suggest reviewing with whitespace changes hidden. Lots of files are changed, but many are alignment type stuff in the drivers or changes to the scripts/doc. Only a handful of source code files were changed and that was mostly associated with the renaming of the pond history field names.

I have confirmed this code is identical to my slponds2 branch which was my working branch prior to the merge of #1020. slponds2 consisted of #1020 plus these changes. This branch, slponds2m, is just the changes on top of #1020 after #1020 was squash merged. The only new code is associated with the 1:ncat_hist change in the accum_hist_field call in ice_history_pond.F90

[eclare108213]

Looks good. Requesting a couple changes in the docs but will approve for expeditiousness.

[apcraig]

OK, my testing is looking good. This is ready to merge. I'll do that later this evening unless I hear otherwise. Thanks!!