Rcpp version of the Projection function for calculating Reference Yield
doprojPI_cpp(lnF, Mmat, Wac, Mac, Pc, N_c, SSN_c, Biomass_c, VBiomass_c, SSB_c,
Vc, retAc, hc, R0ac, proyears, nareas, maxage, movc, SSBpRc, aRc, bRc, SRrelc,
Spat_targc)
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