clean-up formatting of spr/ypr profile
area-specific recruitment

create a new switch recr_dist_area
read after recr_dist_method
if value = 2, then recruitment distribution in each year of a multi-area
model has the recr dist multiplied by the ratio of spb_pop_gp(y) to
spb_pop_gp(virgin).

recr_dist(gp,settle,p)=femfrac(gp)*recr_dist_parm(gp)*recr_dist_parm(N_GP+p)*recr_dist_parm(N_GP+pop+settle);
recr_dist(gp,settle,p)*=SPB_pop_gp(y,p,gp)/SPB_pop_gp(styr-2,p,gp);

note that this only occurs for years after styr