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/amps/stations.h

@@ -1,4 +1,5 @@
 
+void numbering(const char *number, const char **carrier, const char **country, const char **national_number);
 void list_stations(void);
 void sid_stations(int sid);