What this MR does / why does DuMux need it:
Unifies Jacobian pattern computation for CVFE schemes (similar to !3445 (merged) for multidomain)
Fixes fcdiamond Jacobian for explicit time integration
What this MR does / why does DuMux need it:
Unifies Jacobian pattern computation for CVFE schemes (similar to !3445 (merged) for multidomain)
Fixes fcdiamond Jacobian for explicit time integration