The following macros are proposed for removal: `_USE_LEGACY_LAND_` in [full_coupler_mod.F90](https://github.com/NOAA-GFDL/FMScoupler/blob/main/full/full_coupler_mod.F90#L944-L946), [atm_land_ice_flux_exchange.F90](https://github.com/NOAA-GFDL/FMScoupler/blob/main/full/atm_land_ice_flux_exchange.F90#L42-L45) `use_deprecated_io` in [full_coupler_mod.F90](https://github.com/NOAA-GFDL/FMScoupler/blob/main/full/full_coupler_mod.F90#L27-L29) `use_AM3_physics` in [atm_land_ice_flux_exchange.F90](https://github.com/NOAA-GFDL/FMScoupler/blob/main/full/atm_land_ice_flux_exchange.F90#L47-L49)