- avoid the discontinuity between saturated and undersaturated
hydrocarbon density and viscosity. This introduces a dependency of
density and viscosity on the saturation of gas and oil which does
not make much sense from a physical POV. (note that the dependency
on the phase saturations was already there, but it was a
discontinuous one, i.e., it dependeded on S_{o,g} > 0 instead of on
S_{o,g})
- fixes for the fugacityCoefficient() method (it now also works for
wet gas and dead oil, i.e., it avoids a division by zero for
immiscible hydrocarbon phases.)