#371, Link to license broken #376, Fix tile.clear() calls that got overrun during removal of Prototype.js #374, Need to bring up new licenses into 2.2 Branch #336, create OpenLayers.Layer.Graphic to layers created with simple static images #375, No need to exlude Yahoo.js from singlefile build git-svn-id: http://svn.openlayers.org/branches/openlayers/2.2@1740 dc9f47b5-9b13-0410-9fdd-eb0c1a62fdaf