NUPACK 4.0 in Eterna?

@DigitalEmbrace

Here is eterna4.0 in action…

https://forum.eternagame.org/t/first-version-of-nupack-4-0-jupyterlabs-script-with-mfe-and-ensemble-info/4224

I will look into the GU thing later… there is comments about closing pair energies in the energy parameters I saw that you might want to look at. specificly look at the stuff in teh nupack4.0 model specificatios in the user guide here

https://docs.nupack.org/