If --hae is passed, report altitudes as HAE where available, with a H suffix.

This affects interactive mode and SBS output.

dump1090.h

@@ -323,6 +323,7 @@ struct {                             // Internal state
     int   stats_range_histo;         // Collect/show a range histogram?
     int   onlyaddr;                  // Print only ICAO addresses
     int   metric;                    // Use metric units
+    int   use_hae;                   // Use HAE altitudes with H suffix when available
     int   mlat;                      // Use Beast ascii format for raw data output, i.e. @...; iso *...;
     int   interactive_rtl1090;       // flight table in interactive mode is formatted like RTL1090
     char *json_dir;                  // Path to json base directory, or NULL not to write json.