Improved console errors output

Author: demvlad

src/graph_spectrum.js

@@ -459,7 +459,7 @@ export function FlightLogAnalyser(flightLog, canvas, analyserCanvas) {
     };
 
   } catch (e) {
-    console.log(`Failed to create analyser... error: ${e}`);
+    console.error(`Failed to create analyser... error: ${e}`);
   }
 
   this.clearImportedSpectrums = function() {

src/graph_spectrum_calc.js

@@ -507,9 +507,9 @@ GraphSpectrumCalc._getFlightSamplesFreqVsX = function(vsFieldNames, minValue = I
     if (minValue == Infinity) {  // this should never happen
       minValue = 0;
       maxValue = 100;
-      console.log("Invalid minimum value");
+      console.warn("Invalid minimum value");
     } else {
-      console.log("Maximum value %f smaller than minimum value %d", maxValue, minValue);
+      console.warn("Maximum value %f smaller than minimum value %d", maxValue, minValue);
       minValue = 0;
       maxValue = 100;
     }

src/graph_spectrum_plot.js

@@ -1020,7 +1020,7 @@ GraphSpectrumPlot._drawFiltersAndMarkers = function (canvasCtx) {
     }
     offset++; // make some space!
   } catch (e) {
-    console.log("Notch filter fieldName missing");
+    console.warn("Notch filter fieldName missing");
   }
 
   if (this._spectrumType === SPECTRUM_TYPE.FREQUENCY) {