remove unused remove function, add new clear() function

git-svn-id: http://svn.openlayers.org/trunk/openlayers@1149 dc9f47b5-9b13-0410-9fdd-eb0c1a62fdaf

lib/OpenLayers/Tile.js

@@ -60,6 +60,7 @@ OpenLayers.Tile.prototype = {
         this.layer  = null;
         this.bounds = null;
         this.size = null;
+        this.position = null;
     },
 
     /**
@@ -82,9 +83,12 @@ OpenLayers.Tile.prototype = {
     },
 
 
-    /** remove this tile from the ds
+    /** Clear the tile of any bounds/position-related data so that it can 
+     *   be reused in a new location.
      */
-    remove:function() {
+    clear: function() {
+        this.bounds = null;
+        this.position = null;
     },
 
     /**