#529 give tiles gutters - all layers that use Tile.Image must now look after layer.imageSize and layer.imageOffset - this is handled by layer.setTileSize - for untiled layers, setTileSize must be defined by the subclass - gutters are currently supported in Layer.Mapserver and Layer.WMS

git-svn-id: http://svn.openlayers.org/trunk/openlayers@2979 dc9f47b5-9b13-0410-9fdd-eb0c1a62fdaf

examples/mapserver.html

@@ -18,7 +18,8 @@
         function init(){
             map = new OpenLayers.Map( 'map' );
             layer = new OpenLayers.Layer.MapServer( "OpenLayers WMS", 
-                    "http://labs.metacarta.com/wms/vmap0", {layers: 'basic'} );
+                    "http://labs.metacarta.com/wms/vmap0", {layers: 'basic'},
+                    {gutter: 15});
             map.addLayer(layer);
 
             map.setCenter(new OpenLayers.LonLat(lon, lat), zoom);