Changes releative permeability to synch with Mrst
The derivative of the relative permeability at the minimum saturation
are no longer zero
Changes in the 3p relperm definition
The relperm of water and gas is now evaluated at the water and gas
saturation, respectivly. The relperm of oil is still a combination of
the the 2p relperm of water/oil and oil/gas.
Equality is now treated as saturated
The calculated gas resolution factor is compared to
the tabulated resolution to check wether the oil is saturated
or not. The new test judges equality as saturated. This
is cruscial as the gas resolution is set to equal the tabulated value
for the saturated case in the appleyard process.
Compute initial saturations from surface volumes
Add new function is added that computes saturation from surface volumes
solving z = As for each cell. This function is used to compute an
intial guess to the saturations in initState_impl.hpp.
Change name to initBlackoilStateFromDeckUsingRS
The second input of initBlackoilStateFromDeck that computes surface
volumes based on gas/oil ratio is changed from
BlackoilPropertiesInterface to Props. To avoid duplication with the old
initBlackoilStateFromDeck its name is changed to
initBlackoilSurfvolUsingRS.
Added functions for b and mu with isSaturated as input.

Functions for volume factor and viscosity that explicitly take a boolean
variable indicating whether the fluid is saturated or not is added to
the SinglePvtInterface.

Corresponding changes are done in the dependent PVT files.

The new functionality is tested in test_blackoilfluid