More outcomes related to F (reference removal) and SSB

[quang-huynh]

Currently only F/FMSY and SPR are presented as HCR options and outcomes from MSE testing. For both, can also add absolute magnitude (such as F = 0.225 in Pacific herring, Cox et al 2019). For historical and projected outcomes, historical F as a reference (similar to historical SSB),

For SSB, use SSB[50%Rmax] and SSB[90% R/S] in projected outcomes and performance measures.