Support aocc and nvfortran compilers

[danielhollas]

(PR opened on behalf of @kevinstratford, as discussed in #39)

This PR makes OpenFMS compatible with nvfortran and aocc compilers. This required some workarounds due to compiler bugs, but also fixing issues in the RestartModule, where we were writing unallocated arrays! (I am very surprised the other compilers were fined with this).

Closes #39.

[codecov-commenter]

Codecov Report

❌ Patch coverage is 25.00000% with 39 lines in your changes missing coverage. Please review.
✅ Project coverage is 62.45%. Comparing base (2756ddc) to head (f021331).

Files with missing lines	Patch %	Lines
src/modules/TrajectoryIOModule.f90	32.50%	27 Missing ⚠️
src/modules/RestartModule.f90	0.00%	8 Missing and 4 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #44      +/-   ##
==========================================
+ Coverage   55.13%   62.45%   +7.31%     
==========================================
  Files          42       42              
  Lines        6170     7519    +1349     
  Branches      832      835       +3     
==========================================
+ Hits         3402     4696    +1294     
- Misses       2414     2574     +160     
+ Partials      354      249     -105     

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[danielhollas]

So the CI is finally green, including the aocc and nvfortran jobs.
@kevinstratford in case you want to have a look.

(I still need to do a bit of manual testing since not all the codepaths modified here are covered by tests, but otherwise this is good to go).

Notably, earlier versions of nvfortran (e.g. 26.1) fails to compile the unit tests, but the latest version (26.5 works) so I won't bother implementing the workaround.

[kevinstratford]

Restricting myself to the Fortran. A couple of extra bits of commented-out code have appeared. May want to try to remove.

Otherwise, ok!

[danielhollas]

Thanks for taking a look. I'll keep those bits around since we might need them soon, and if not I am going to do a larger cleanup of commented out code separately in one swoop.