LFRic2UM pseudo-levels

[mo-lottieturner]

PR Summary

Sci/Tech Reviewer:
Code Reviewer:

is related to #265

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trac.log

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[mo-lottieturner]

Currently the problem is that when handling pseudo-levels, it assumes that every level is its own 2d field rather than putting them all in the same field. How to get it to not do this is yet to be discovered