first pass at add content from xforms ui

- added an add content panel to the file picker which enables browsing the local disk to select content to upload.  the file is uploaded without requiring a browser refresh by targeting a hidden iframe.  the server response includes a js call which notifies the form that the upload is complete.
- added annotations to ajax methods to enable specifying the response mime type of the method.  needed for uploadFile which returns html rather than xml
- minor cleanup in schemaformbuilder
- added mapping between xsl-fo mimetypes and those in mimetype map


git-svn-id: https://svn.alfresco.com/repos/alfresco-enterprise/alfresco/HEAD/root@4576 c4b6b30b-aa2e-2d43-bbcb-ca4b014f7261

source/java/org/alfresco/web/forms/RenderingEngine.java

@@ -37,6 +37,11 @@ public interface RenderingEngine
       extends Exception
    {
 
+      public RenderingException(final String msg)
+      {
+         super(msg);
+      }
+
       public RenderingException(final Exception cause)
       {
          super(cause);