recreate SpinupStability script

[wwieder]

This is a good example of an NCL script that would be helpful to transfer over the a jupyter notebook. @olyson, is there a newer version of this around?

/glade/u/home/wwieder/NCL_code/SpinupStability_v7.ncl

[olyson]

/glade/p/cgd/tss/CLM50_data_tools/SpinupStability_v9.ncl