Pullup changes to trunk for RC2. Includes drag-fires click changes

(Closes #982), comment/documentation/requires changes (Closes #983, #993, #988),
Fixing post support in proxy.cgi (Closes #991), baseLayer zoom level change 
(Closes #990), typo in Layer.Image.setURL (Closes #985), and a fix or the
Layer.Google bug caused by Google's changing internals (#994). RC2, here we 
come.


git-svn-id: http://svn.openlayers.org/branches/openlayers/2.5@4390 dc9f47b5-9b13-0410-9fdd-eb0c1a62fdaf

lib/OpenLayers/Map.js

@@ -1352,7 +1352,7 @@ OpenLayers.Map = OpenLayers.Class({
 
 
     /**
-     * APIMethod: getZoomForExteng
+     * APIMethod: getZoomForExtent
      * 
      * Parameters: 
      * bounds - {<OpenLayers.Bounds>}