Initialization of SWL-family from EclipseState.  (Needs PR opm-parser/#278.)

This allows consistent initialization from decks where scaling keywords are specified in terms of meta-keywords like EQUAL, COPY, etc.  In particular this includes an unmodified Norne deck.
Note the this change temporarily (until EclipseState catches up) poses restrictions to the use of the ENPTVD keyword (not used in the Norne deck).

Well, the old stuff actually worked so it can't be 1-1 ...

"Defaulted" might be more precise than "masked".  In any case, the point is that a completely defaulted  column in one of these tables signals that the corresponding scaling parameter should be extracted from SWOF/SGOF.