Added size() method to FlightConfiguration and FlightConfigurationImpl

to determine if a component has any flight configurations other than
default.

core/src/net/sf/openrocket/rocketcomponent/FlightConfiguration.java

@@ -66,4 +66,9 @@ public interface FlightConfiguration<E extends ChangeSource> extends FlightConfi
 	 */
 	public void resetDefault(String id);
 	
+	/**
+	 * Return the number of specific flight configurations other than the default.
+	 * @return
+	 */
+	public int size();
 }

core/src/net/sf/openrocket/rocketcomponent/FlightConfigurationImpl.java

@@ -81,6 +81,12 @@ class FlightConfigurationImpl<E extends FlightConfigurableParameter<E>> implemen
 	
 	
 	
+	@Override
+	public int size() {
+		return map.size();
+	}
+	
+	
 	@Override
 	public E get(String id) {
 		if (map.containsKey(id)) {