Update conserv_check implementation

[apcraig]

PR checklist

• Short (1 sentence) summary of your PR:
  Update conserv_check implementation

• Developer(s):
  apcraig

• 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.
  All tests pass bit-for-bit on cheyenne
  https://github.com/CICE-Consortium/Test-Results/wiki/icepack_by_hash_forks#75185037cf80be127deb9a1c26797ab72591e1bb

• 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 CICE or any other models?

  • Yes
  • No, but this will lead to an update in CICE that depends on these changes

• Does this PR add any new test cases?

  • Yes
  • No, but adds conserv_check in alt03 test

• 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/.)

  • Yes
  • No, does the documentation need to be updated at a later time?
    • Yes
    • No

• Please provide any additional information or relevant details below:

• Rename l_conservation_check to conserv_check

• Add conserv_check to namelist in icepack driver

• Add conserv_check argument to icepack_parameters so it can be set by a driver

• Add conserv_check to alt03 test

• Update column_conservation_check fieldid strings

• Update documentation including run of icepack.setup --docintfc

[apcraig]

This should be ready to merge. Once merged, I will add this to CICE-Consortium/CICE#450 and update CICE to leverage the new conserv_check icepack parameter argument.

[eclare108213]

Nice, thanks.