Added spur shift debugging and IF help text

sa_core.c

@@ -1800,6 +1800,9 @@ sweep_again:                                // stay in sweep loop when output mo
       }
 #ifdef __DEBUG_AGC__                 // For debugging the AGC control
       stored_t[i] = (SI4432_Read_Byte(0x69) & 0x0f) * 3.0 - 90.0; // Display the AGC value in the stored trace
+#endif
+#ifdef __DEBUG_SPUR__                 // For debugging the spur avoidance control
+      stored_t[i] = (avoid_spur(frequencies[i]) ? -60.0 :  - 90.0); // Display when to do spur shift in the stored trace
 #endif
       if (scandirty || setting.average == AV_OFF) {             // Level calculations
         actual_t[i] = RSSI;

ui_sa.c

@@ -1440,7 +1440,7 @@ static const menuitem_t menu_settings[] =
 {
   { MT_CALLBACK | MT_LOW, 5,    "\2LO\0OUTPUT",menu_settings2_cb},
   { MT_KEYPAD, KM_ACTUALPOWER,  "\2ACTUAL\0POWER",  NULL},
-  { MT_KEYPAD | MT_LOW, KM_IF,  "\2IF\0FREQ",       NULL},
+  { MT_KEYPAD | MT_LOW, KM_IF,  "\2IF\0FREQ",       "Set to zero for auto IF"},
   { MT_SUBMENU,0,               "\2SCAN\0SPEED",         menu_scanning_speed},
   { MT_KEYPAD, KM_REPEAT,       "\2SAMPLE\0REPEAT",          "1..100"},
   { MT_SUBMENU | MT_LOW,0,      "\2MIXER\0DRIVE",      menu_drive},