rm arbitrary default parameters from roughness models

e.g. K_CorrelationModel(double sigma = 0, double hurst = 0.7, double lateralCorrLength = 25, double maxSpatFrequency = 0.5);

why hard-code these arbitrary parameter values?

changed milestone to %v22

added API discuss in team! labels

Agree, there is no real need for this.

mentioned in merge request !2934 (merged)

mentioned in commit de6fa485

closed with merge request !2934 (merged)