Commit scale-based methods back into trunk. Layers or Maps now support setting

a list of scales or resolutions in the options to the constructor, from which
resolutions are calculated. Map now has a 'setScale' function which will allow
you to zoom to as close to a given scale as possible.


git-svn-id: http://svn.openlayers.org/trunk/openlayers@1171 dc9f47b5-9b13-0410-9fdd-eb0c1a62fdaf

lib/OpenLayers/Layer/Grid.js

@@ -288,17 +288,6 @@ OpenLayers.Layer.Grid.prototype =
   /*                                                      */
   /********************************************************/
   
-    /** 
-     * @returns Degrees per Pixel
-     * @type float
-     */
-    getResolution: function() {
-        var maxRes = this.map.getMaxResolution();
-        var zoom = this.map.getZoom();
-
-        return maxRes / Math.pow(2, zoom);
-    },
-    
     /** Calculates based on resolution, center, and mapsize
      * 
      * @returns A Bounds object which represents the lon/lat bounds of the