ug_imp_nmb_acc: Those changes to the number accuracy of the implicit …

[aronroland]

Put the number accuracy of the solver to real precision. This was done once and somehow it got lost.

Pull Request Summary

When using the combination of the number precision as it was in develop the solver did not converge to number accuracy, which it does now.

Description

If u run e.g. tp2.6 and the solver does not converge below 10E-12, now it does.

Please also include the following information:

• Add any suggestions for a reviewer
  bug
  -->

Issue(s) addressed

none

Commit Message

Correcting number accuracy within the implicit ug solver.

Check list

• Branch is up to date with the authoritative repository (NOAA-EMC) develop branch.
• Checked the checklist for a developer submitting to develop.
• If a version number update is required, checked the updating version number checklist.
• If a new feature was added, a regression test for testing the new feature is added.

Testing

• How were these changes tested?
  tp2.6
• Are the changes covered by regression tests? (If not, why? Do new tests need to be added?)
  needs to be discussed, anyway. From my point of view we need to add more tests in e.g. 2.6, it will be discussed.
• Have the matrix regression tests been run (if yes, please note HPC and compiler)?
  No
• Please indicate the expected changes in the regression test output, (Note the list of known non-identical tests.)
  Yes, if the implicit solver is of concern.
• Please provide the summary output of matrix.comp (matrix.Diff.txt, matrixCompFull.txt and matrixCompSummary.txt):
  2 be continued.

[JessicaMeixner-NOAA]

@aronroland thank you for submitting this PR! As soon as the testing information from ERDC is added we'll start the tests and review.

[JessicaMeixner-NOAA]

Converting to draft. Please mark as ready to review when testing information is available.