update io_pio and io_pio2 for fsd input and output fields

[apcraig]

PR checklist

• Short (1 sentence) summary of your PR:
  Update io_pio and io_pio2 to handle fsd fields
• 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.
  This was tested in RASM with io_pio. io_pio2 was copied from io_pio and then the pio_setframe call was updated. io_pio2 has not been tested. Standalone CICE testing does not test this code at the present time. Testing of the io_pio and io_pio2 code is inadequate. See further comments below.
• 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 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/. 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 provide any additional information or relevant details below:

Addresses #443.

Also related to #246.

This could be merged now, but depending on status of #246, we may want to do #246 first, with, or after this PR.

[dabail10]

I was about to email you with this. There are a couple issues. The interfaces for io_pio and io_pio2 are different for standalone and coupled. So, do we ifdef what we need here? Also, I can't figure out why it is not finding the subroutine pio_init. I'll email offline.

[apcraig]

I'm going to merge this at this only affects pio code. We need this code to address some failures in #246.