Convert KaMap and WorldWind to be isBaseLayers, and change FullExtent to MaxExtent.

git-svn-id: http://svn.openlayers.org/trunk/openlayers@813 dc9f47b5-9b13-0410-9fdd-eb0c1a62fdaf

lib/OpenLayers/Layer/WorldWind.js

@@ -33,7 +33,7 @@ OpenLayers.Layer.WorldWind.prototype =
     },
     addTile:function(bounds,position) {
         var zoom = this.map.getZoom();
-        var extent = this.map.getFullExtent();
+        var extent = this.map.getMaxExtent();
         zoom = zoom - Math.log(this.map.maxResolution / (this.lzd/512))/Math.log(2);
         if (this.map.getResolution() <= (this.lzd/512) && zoom <= this.zoomLevels) {
             var deg = this.lzd/Math.pow(2,zoom);
@@ -55,6 +55,9 @@ OpenLayers.Layer.WorldWind.prototype =
             return tile;
         }
     },
+    isBaseLayer: function() {
+        return true;
+    },    
     /** @final @type String */
     CLASS_NAME: "OpenLayers.Layer.WorldWind"
 });