Add comment for Barrett 4100 -- not ready for prime time

rigs/barrett/4100.c

@@ -244,7 +244,7 @@ struct rig_caps barrett4100_caps =
     .mfg_name =         "Rhode&Schwarz",
     .version =          BACKEND_VER ".1",
     .copyright =        "LGPL",
-    .status =           RIG_STATUS_BETA,
+    .status =           RIG_STATUS_BETA, // do no promote until somebody confirms it works ok -- nobody to test it
     .rig_type =         RIG_TYPE_TRANSCEIVER,
     .targetable_vfo =   RIG_TARGETABLE_FREQ | RIG_TARGETABLE_MODE,
     .ptt_type =         RIG_PTT_RIG,