add albedo option to discs

src/binary_c_function_macros.h

src/binary_c_structures.h

src/binary_star_functions/apply_other_stellar_derivatives.c

src/disc/cbdisc_eccentricity_pumping_rate.c

src/disc/disc_build_disc_zones.c

src/disc/disc_edge_stripping.c

src/disc/disc_evolve_disc_structure.c

src/disc/disc_init_binary_structure.c

src/disc/disc_set_disc_initial_guesses.c

src/disc/disc_structure_functions.c

src/disc/disc_thermal_zones.h

src/disc/new_disc.c

src/evolution/apply_derivatives.c

src/evolution/evolution_split.c

src/memory/build_store_contents.c

src/memory/free_store_contents.c

src/setup/cmd_line_args_list.h

src/setup/cmd_line_macros.h

src/setup/set_default_preferences.c

tbse