Predict gillnet selectivity (old Millar method)
rcurves_Millar(type, meshsizes, rel, pars, plotlens)
("norm.loc", "norm.sca", "gamma", "lognorm")
mesh sizes
relative powers (one for each mesh size)
selection curve parameters
vector of new mesh sizes for selectivity prediction
selectivities
Millar, R. B., Holst, R., 1997. Estimation of gillnet and hook selectivity using log-linear models. ICES Journal of Marine Science: Journal du Conseil, 54(3):471-477