Cleanup/interfacial areas
- create test for cctpfa nonequilibrium
- cleanup thermal non-equilibrium localresidual: qBoil is a special case which should not be calculated for all models with 1 liquid energy equation
- for 1 energyequation for the fluid: remove interfacial area calculation from localresidual but instead transfer that to spatialparams/volumevariables
Fixes #555 (closed), closes #566 (closed)