Remove _old options for tfrz_option

[apcraig]

PR checklist

• Short (1 sentence) summary of your PR:
  Remove _old options for tfrz_option
• 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.
  Full Icepack test suite run on cheyenne, all tests pass. Several tests changes answer (bgc, alt03, alt04, thermo1) as expected. Also ran test suite with these modifications within CICE, all tests pass, some results change answer. https://github.com/CICE-Consortium/Test-Results/wiki/icepack_by_hash_forks#2a6741c1ec958858e330b327a4a335fa511f405a
• How much do the PR code changes differ from the unmodified code?
  • bit for bit, except certain test cases include bgc, alt03, alt04, thermo1
  • different at roundoff level
  • more substantial
• Does this PR create or have dependencies on CICE or any other models?
  • Yes, requires changes in CICE (see Remove and update tfrz_options settings, remove _old options. CICE#883) before this version of Icepack can be used in CICE
  • No
• Does this PR add any new test cases?
  • Yes
  • 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/.)
  • Yes
  • No, does the documentation need to be updated at a later time?
    • Yes
    • No
• Please provide any additional information or relevant details below: