add variants of all methods which take a deck of the new parser to the rock properties
use the (new) RocktabTable class for rock compressibility

thanks to @bska for pointing this out
handle the ROCK keywords using the new opm-parser utility class
more typos

thanks to @bska
Merge pull request #467 from andlaus/parser-integrate_rock_properties

add variants of all methods which take a deck of the new parser to the rock properties