allow frequency display precision to be set via configuration

config_webrx.py

@@ -269,6 +269,10 @@ waterfall_auto_level_margin = {"min": 3, "max": 10, "min_range": 50}
 #        \_waterfall_auto_level_margin["min"]_/ |__ current_min_power_level          | \_waterfall_auto_level_margin["max"]_/
 #                                                          current_max_power_level __|
 
+# This setting allows you to modify the precision of the frequency displays in OpenWebRX.
+# Set this to the number of digits you would like to see:
+frequency_display_precision = 5
+
 # This setting tells the auto-squelch the offset to add to the current signal level to use as the new squelch level.
 # Lowering this setting will give you a more sensitive squelch, but it may also cause unwanted squelch openings when
 # using the auto squelch.