STASH code to CF name translations: corrections and additions for GLOMAP-mode

[jhemmings]

I propose these changes to Metarelate's metOcean knowledge base.
The changes are correct, to the best of my knowledge.
I agree to my username being used to label these changes.
Notify:
@jhemmings
@marqh
https://www.metarelate.net/metOcean/controlpanel/?branch=c51aae57a9b9cc192695ef18aa2e057d562d844e%2F

[marqh]

merged and adopted with thanks

pushed to Iris in
SciTools/iris#3011