add artificial accretion rate on a per-stellar type basis

src/binary_c_structures.h

src/binary_star_functions/artificial_mass_accretion_rates.c

src/evolution/evolution_difflog.c

src/logging/log_flags.def

src/setup/cmd_line_args_list.h

src/stellar_structure/stellar_structure_AGB.c

src/stellar_structure/stellar_structure_WD.c

src/timestep/timestep_RLOF.c

src/timestep/timestep_limits.c

src/timestep/timestep_set_default_multipliers.c

tbse