first pass on repeats.

- refactoring of schemaformbuilder to remove unnecessary methods/cleanup and modifications to get it to emit triggers that i need for insert at the top and insert after
- implementation of ajax server side method for setting the repeat index and support for capturing and sending back event responses for all server requests.
- implementation of client side repeat support: dom manipulation of repeat elements, identifying and relating widgets with model data, creating prototype clones, and support for some XFormsEvent (chiba-index-changed, chiba-item-inserted, chiba-prototype-cloned, chiba-id-generated)
- changing background-colour to background-color in the dashlet.  funny.
- handling a null pointer exception in the errorbean when an error is thrown from the ajax stuff.
- minor debugging enhancements in TemplatingService



git-svn-id: https://svn.alfresco.com/repos/alfresco-enterprise/alfresco/BRANCHES/WCM-DEV2/root@3814 c4b6b30b-aa2e-2d43-bbcb-ca4b014f7261

source/java/org/alfresco/web/bean/ErrorBean.java

@@ -123,7 +123,8 @@ public class ErrorBean
    {
       StringWriter stringWriter = new StringWriter();
       PrintWriter writer = new PrintWriter(stringWriter);
-      this.lastError.printStackTrace(writer);
+      if (this.lastError != null)
+	  this.lastError.printStackTrace(writer);
       
       // format the message for HTML display
       String trace = stringWriter.toString();