Phi: add a scale to map

webgui/topics/Map.html

@@ -11,4 +11,5 @@
     },
     overlays: overlays,
     hasFollowAircraft: true,
+    scale: { metric: false }
   }}"></div>

webgui/widgets/map.js

@@ -78,6 +78,10 @@ define(
                     L.control.layers(baseLayers, params.overlays).addTo(self.map);
                 }
 
+                if (params && params.scale) {
+                  L.control.scale(params.scale).addTo(self.map);
+                }
+
                 L.RotatedMarker = L.Marker.extend({
                     options : {
                         angle : 0