Add format-level layerOptions configuration property to WMC parser, to support

the configuration of user-preferred layer options in order to allow 
configurability of options like buffer, ratio, etc. r=ahocevar (Closes #1411).


git-svn-id: http://svn.openlayers.org/trunk/openlayers@6534 dc9f47b5-9b13-0410-9fdd-eb0c1a62fdaf

examples/wmc.html

@@ -19,7 +19,7 @@
         OpenLayers.IMAGE_RELOAD_ATTEMPTS = 2;
         OpenLayers.Util.onImageLoadErrorColor = "transparent";
         
-        var format = new OpenLayers.Format.WMC();
+        var format = new OpenLayers.Format.WMC({'layerOptions': {buffer: 0}});
         var doc, context, map;
         
         function init() {
@@ -137,7 +137,10 @@
         <button onclick="readWMC(true);">read and merge</button>
         <textarea id="wmc">paste WMC doc here</textarea>
 	<div id="docs">
-            This is an example of parsing WMC documents.
+            This is an example of parsing WMC documents. <br />
+            The format class has a layerOptions property, which can be used
+            to control the default options of the layer when it is created
+            by the parser.
 	</div>
   </body>
 </html>