Adds event logging, code cleanup and some decoder issue resolution.

src/spectrum/SpectralDisplayPanel.java

@@ -259,6 +259,8 @@ public class SpectralDisplayPanel extends JPanel
 				case SPECTRUM_LINE:
 					mColorSpectrumLine = colorSetting.getColor();
 					break;
+				default:
+					break;
 			}
 		}
     }