(Closes #868) implement support for kernels with field arguments that specify nlayers/ndata

[arporter]

No description provided.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (d9515d0) to head (9394da7).

Additional details and impacted files

@@            Coverage Diff             @@
##            master     #3510    +/-   ##
==========================================
  Coverage   100.00%   100.00%            
==========================================
  Files          399       399            
  Lines        56094     56196   +102     
==========================================
+ Hits         56094     56196   +102     

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[arporter]

This is very close to being ready. I need to finish doing a 'self review' and deal with the various TODOs, esp. where I'm using LFRicTypes("MeshHeightDataSymbol") for ndata.

[arporter]

This is ready for a first review now. It's slightly bigger (in terms of files touched) than I would like because I realised that at some point during the last PR, I mixed 'nlevels' with 'nlayers'. I've gone through and fixed this so that we only use 'nlayers' now. I've also altered the naming used for all nlayers arguments and that modified a bunch of tests too.

[arporter]

ITs were all green. @stevemullerworth and @christophermaynard it would be good if someone at the MO could also test this branch out to check that I haven't missed anything.