replaced delet with model->derivative

src/RLOF/RLOF_orbital_changes.c

src/RLOF/RLOF_update_eccentricity.c

...ions/angular_momentum_loss_mechanisms_for_close_systems.c

src/binary_star_functions/binary_star_functions_prototypes.h

src/binary_star_functions/calc_intrinsic_spin.c

src/binary_star_functions/circumbinary_disk.c

src/binary_star_functions/tidal_shrink_up.c

src/binary_star_functions/update_and_check_eccentricity.c

src/binary_star_functions/wind_loss.c

src/binary_structures.h

src/iteration/init_common.c

src/iteration/initialize_parameters.c

src/iteration/iterate2.c

src/perl/scripts-flexigrid/yield_vs_time.pl

src/setup/stardata_status.c

tbse