Minor fixes in reference manual.
CRA-542 Correlations should not be changed from distributionwithtrendstorage to double in xmlmodelfile. Change to double in Tabulated...Storage to be able to estimate the correlations from blocked logs.
CRA-530 Make error text instead of warning if variables for seismic quality grid are given without requesting the grid as output.
CRA-542 All correlation vectors need to be given size n_vintages
CRA-542 Include comment in the distributions...storage.h that the correlations will be converted to doubles.
Merge pull request #21 from ulvmoen/master

CRA-542 Correlations should not be changed from distributionwithtrendstorage to double in xmlmodelfile