CRA-683: Fixed the problem with dz not set, and at the same time removed bug where ModelAVODynamic crashed when wavelet was from file.

Note that this does not solve the problem in CRA-683, as there still is a scaling issue between wells and seismic data. (Location of seismic data is given in km, wells in m)
Merge pull request #100 from RagnarHauge/CRA-505

CRA-683: Fixed the problem with dz not set, and at the same time removed...