Merge pull request #134 from RagnarHauge/CRA-505

CRA-720: Testcase 6 is now OK. Got small differences, but quite tolerabl...
#CRA-717: Fixed a bug in the setup of prior corr FFT grids
Merge branch 'CRA-717' into CRA-505
Merge pull request #136 from enesvold/CRA-505

CRA-717
CRA-721: Fixed bugs related to moving wells to optimal location. Also cleaned up Ricker wavelet routine.
Merge branch 'CRA-721' into CRA-505