TACS support (variations added to AMPS code)

These are:

- Bandwidth only 25 KHz, so lower deviations
- Data rate only 8000 KHz
- SID is called AID (Area ID)
- MIN1 coding is different

src/tacs/main.c

@@ -0,0 +1,14 @@
+#include "../amps/main.h"
+#include "../amps/tones.h"
+#include "../amps/outoforder.h"
+
+const int tacs = 1;
+
+int main(int argc, char *argv[])
+{
+	/* init common tones */
+	init_tones();
+	init_outoforder();
+
+	return main_amps_tacs(argc, argv);
+}