Scaling of capillary pressure.
SWATINIT: Initialisation and capillary pressure scaling.
Adjustments for vanishing oil phase.
Make use of EclipseState for EQLNUM and SWATINIT.
Included inititalisation of surface volumes.
Merge pull request #607 from osae/swatinit

Scaling of capillary pressure / initialisation from kw SWATINIT.