Flux stabilisation methods
Created by: jpolton
dynnxt.F90 and dynspg.F90 had hacks to stabilise a different config that someone else was developing. Are they needed?
They have associate namelist_cfg paremeters:
&namdyn_spg ! surface pressure gradient (default: NO)
ln_ulimit =.true.
cn_ulimit = 0.9
cnn_ulimit = 0.54