Issue459 oasis ocean coupling

[einola]

Pull Request Title

Fixes #459

Task List

• [ ] Defined the tests that specify a complete and functioning change (It may help to create a design specification & test specification)
• [ ] Implemented the source code change that satisfies the tests
• [ ] Documented the feature by providing worked example
• [ ] Updated the README or other documentation
• [ ] Completed the pre-Request checklist below

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Change Description

Please write a summary of the change and specify which Issue this fixes. This should cover the motivation for making the change and provide almost enough context to review the change in isolation. While the issue description is a good place to discuss the failure/requirements, this is the ideal space for explaining why this design fixes the issue and why you designed it the way you did.

• If there are important design decisions, particularly those that leverage functionality outside this change or were caused by existing limitations, they should be noted here.
• If there is a design specification which relates to this PR, please provide a link to it here.
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• If there are any dependencies (third-party or internal downstream) which are added or impacted, please note them here. And if their limitations informed your design, please note how they did so here (particularly if this information was not captured in a design specification).

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Test Description

Please describe the tests you have written that verify the enhancement works or that the bug fix has been remedied. For a bug fix, please ensure a complete description of the failure is available here or in the issue such that a reviewer can verify that the testing is suitable. This is a good place to highlight any manual testing you may have had to perform.

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If your tests fixes any issue, please explain that in the comment you provided in the test file by referencing the issue within the comment and please record the mapping here e.g.

• testA fixes issue 404
• testB fixes issue 999

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Documentation Impact

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Other Details

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Pre-Request Checklist

• [ ] The requirements of this pull request are fully captured in an issue or design specification and are linked and summarised in the description of this PR
• [ ] No new warnings are generated
• [ ] The documentation has been updated (or an issue has been created to track the corresponding change)
• [ ] Methods and Tests are commented such that they can be understood without having to obtain additional context
• [ ] This PR/Issue is labelled as a bug/feature/enhancement/breaking change
• [ ] File dates have been updated to reflect modification date
• [ ] This change conforms to the conventions described in the README

Please complete your pull request description and delete the instructional text before submitting.

Congratulations and thank you for making your contribution to neXtSIM_DG!

[einola]

I set up this draft PR to help @andreapiacentini and me figure out how to get the OASIS coupling with NEMO working.

There's still a good deal of work left ...