Merge pull request #169 from ulvmoen/master

Fix for rock physics
CRA-678: Fixed bug with BlockWellsForEstimation if there is no seismic data.
Merge branch 'master' of git://github.com/CRAVA/crava into CRA-738
CRA-751: Fixed estimation mode and background for multiple intervals, added CombineResult under WriteEstimationResults and WriteOutputSurfaces under SetupOutputSimbox.
CRA-751: Added that background must be ok before estimating correlations.
Merge pull request #170 from hgolsen/master

CRA-751: Multizone background in estimation mode
CRA-748 Include porosity logs