Other schemes for FSSH hopping probability

[danielhollas]

Take a look at the following article for another approach for determining the surface hopping probability.

https://aip.scitation.org/doi/10.1063/5.0024372

Basile thinks it might be interesting to try implementing this and try it out. It shouldn't be too difficult to implement according to the paper authors, and hopefully the recent refactor might help as well.