document bioecon forecasting feature

[k-doering-NOAA]

it would be great to see documentation of all permutations of bycatch fleets and non-optimized fleets; but seems a lower priority.

Originally posted by @Rick-Methot-NOAA in nmfs-ost/ss3-source-code#254 (comment)

[e-perl-NOAA]

@Rick-Methot-NOAA I went through the original issue but I'm a bit confused on what is meant by 'documenting all permutations of bycatch fleets and non-optimized fleets'. Is there a list of these permutations in the source code somewhere?

[Rick-Methot-NOAA]

I think this is something that I would need to get started.