adds {modeling_goal} wildcard, replaces one modeling pseudorule
adds {modeling_goal} wildcard, replaces one modeling pseudorule

we now add the modeling_goal wildcard, which will help keep things
organized and me sane (it doesn't actually influence how any of the
modeling calls are made, just gives them a sub-folder)

I also replaced model_iso_simulated with model_recover_initial, with a
similar goal

billbrod/spatial-frequency-preferences,billbrod/spatial-frequency-preferences,billbrod/spatial-frequency-preferences