Implement the Eggenweiler-Rybak coupling conditions
There have been new coupling conditions developed that we should also implement for the partitioned coupling. The coupling conditions have been implemented for the monolithic coupling in DuMuX already dumux-repositories/dumux!2277 (merged).
Preprint: https://arxiv.org/pdf/2006.12096.pdf Related merge request for the monolithic implementation: dumux-repositories/dumux!2277 (merged)