another step towards refactoring

src/annotations.mli

src/backends/Ada/ada_backend.ml

src/backends/Ada/ada_backend.mli

src/backends/Ada/ada_backend_adb.ml

src/backends/Ada/ada_backend_adb.mli

src/backends/Ada/ada_backend_ads.ml

src/backends/Ada/ada_backend_ads.mli

src/backends/Ada/ada_backend_common.ml

src/backends/Ada/ada_backend_common.mli

src/backends/Ada/ada_backend_wrapper.ml

src/backends/Ada/ada_backend_wrapper.mli

src/backends/Ada/ada_printer.ml

src/backends/Ada/misc_lustre_function.mli

src/backends/Ada/misc_printer.mli

src/backends/C/c_backend.ml

src/backends/C/c_backend.mli

src/backends/C/c_backend_common.ml

src/backends/C/c_backend_common.mli

src/backends/C/c_backend_header.ml

src/backends/C/c_backend_header.mli