butterflies: misc fixes

src/modules/butterflies/butterflies_action_helpers.c

src/modules/butterflies/butterflies_actions.c

src/modules/butterflies/butterflies_dispersal.c

src/modules/butterflies/butterflies_filenames.c

src/modules/butterflies/butterflies_main.c

src/modules/butterflies/butterflies_populations.c

src/modules/butterflies/butterflies_stats.c