CRA-543 Estimate variables in the bounding model

Has not been tested, as well->getPorosity(dymmy) not can be implemented before multizone inversion is ready.
Merge branch 'CRA-543'
CRA-562 Include trend parameters s1 and s2 in BlockedLogsForRockPhysics
CRA-563 Variables in the rock physics models should not be estimated in 4D
Merge pull request #32 from ulvmoen/master

Estimate variables in the Bounding rock physics model