fixes for loadable modules

src/cats/actions/setup_actions.c

src/cats/actions/setup_actions.h

src/cats/cats.c

src/cats/configuration/load_configuration_species_params.c

src/cats/grids/cats_grid.c

src/cats/modules/load_module.c

src/cats/stats/write_stats.c

src/cats/vital_rates/default_vital_rates.c

src/cats/vital_rates/setup_rates.c

src/cats/vital_rates/setup_rates.h

src/cats/vital_rates/vital_rates.h