Function used by get_hcr_ip()
to generate input data for an assessment based HCR.
The input to the HCR is depletion (i.e. Biomass / K).
assessment(stock, mp_params, yr, iters = 1:dim(stock$biomass)[1])
The stock object
A named list of MP parameters (with est_sigma and est_bias elements)
The timestep that the biomass is taken from.
Numeric vector of iters. Default is all of them.