[Feature]: Add F_dead-at-age to output

[Rick-Methot-NOAA]

Describe the solution you would like.

The current AGE_SELEX report:32
shows F, but that F does not take into account discarding.
Propose to add new line with:
SS2out << "F+ " << f << " " << y << " " << s << " " << sx(g) << " " << g << " " << y << "_" << f << "_F" << Hrate(f, t) * sel_dead_num(t, f, g) << endl;
keep current line as:
SS2out << "F " << f << " " << y << " " << s << " " << sx(g) << " " << g << " " << y << "_" << f << "_F" << Hrate(f, t) * save_sel_num(t, f, g) << endl;

The final implementation of this feature labels it Fdead and proposes this addition to the manual:
The age-selex table in report.sso provides two versions of F. The first, which has been in existence for a long time, is simply labelled "F". It is based on selectivity and is the F-at-age that selects, i.e. catches the fish. The new line is labelled "Fdead" and is the mortality rate caused by fishing. If there is no discarding or if all discarded fish are dead, these two values will be identical. However, if there is discarding and some discarded fish survive, then Fdead will be less that F. F creates the total catch (retained and discarded dead and discarded alive). Fdead is used in the survival calculations, so Z = M + Fdead.

Describe alternatives you have considered

let users stay confused

Statistical validity, if applicable

Andre thinks it is better

Describe if this is needed for a management application

Yes, because it makes the review easier to complete

Additional context

No response