re-structure SS7 code and MGW NAT code into separate modules

This repository now only contains the SS7 code
diff --git a/rel/reltool.config b/rel/reltool.config
new file mode 100644
index 0000000..14e94bb
--- /dev/null
+++ b/rel/reltool.config
@@ -0,0 +1,31 @@
+{sys, [
+       {lib_dirs, ["../../"]},
+       {rel, "osmo", "1",
+        [
+         kernel,
+         stdlib,
+         sasl
+        ]},
+       {rel, "start_clean", "",
+        [
+         kernel,
+         stdlib
+        ]},
+       {boot_rel, "osmo"},
+       {profile, embedded},
+       {excl_sys_filters, ["^bin/.*",
+                           "^erts.*/bin/(dialyzer|typer)"]},
+       {app, sasl, [{incl_cond, include}]},
+       {app, osmo_ss7, [{incl_cond, include}]}
+      ]}.
+
+{target_dir, "osmo"}.
+
+{overlay, [
+           {mkdir, "log/sasl"},
+           {copy, "files/erl", "{{erts_vsn}}/bin/erl"},
+           {copy, "files/nodetool", "{{erts_vsn}}/bin/nodetool"},
+           {copy, "files/osmo", "bin/osmo"},
+           {copy, "files/app.config", "etc/app.config"},
+           {copy, "files/vm.args", "etc/vm.args"}
+           ]}.