update icepack, copyright, version number

[apcraig]

PR checklist

• Short (1 sentence) summary of your PR:
  Update Icepack, copyright date, and version number is prep for 6.0.1 release
• 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.
  #efdb29b4e2362f97d, https://github.com/CICE-Consortium/Test-Results/wiki/cice_by_hash_forks
• 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
    but only that it updates Icepack, there are no dependencies
• 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:

Updated icepack to #efdb29b4e2362f97d == Icepack1.1.1
Changed Copyright date to 2019
Change CICE internal version number to 6.0.1

[duvivier]

Why are there so many more places in CICE that we have to change the date compared to Icepack? In any case there are no issues here from my end.

[apcraig]

I realized after the fact that I missed one Copyright date in Icepack. I don't plan to fix it in the Icepack tag, but will after. I agree that we might want to consider if there are ways to consolidate the Copyright text somehow so we can share a single "file" that is used both in the documents and in the source code. I will create an issue to look into that.

[eclare108213]

I hope you found all of these! I agree it would be good to somehow automate these by connecting them to a single source.