add comment regarding current handling of base layers

git-svn-id: http://svn.openlayers.org/trunk/openlayers@642 dc9f47b5-9b13-0410-9fdd-eb0c1a62fdaf

lib/OpenLayers/Map.js

@@ -151,6 +151,12 @@ OpenLayers.Map.prototype = {
         }
         this.layers.push(layer);
 
+        // hack hack hack - until we add a more robust layer switcher,
+        //   which is able to determine which layers are base layers and 
+        //   which are not (and put baselayers in a radiobutton group and 
+        //   other layers in checkboxes) this seems to be the most straight-
+        //   forward way of dealing with this. 
+        //
         if (layer.isBaseLayer()) {
             this.baseLayer = layer;
         }