make gpgfp readonly and hidden per default, reference jquery

- add support for per template extra head elements
- add jquery link to showform.mako
- hide gpgfpfield and make it read-only

ddportfolioservice/public/stylesheets/style.css

@@ -54,4 +54,8 @@ td p {
 
 .errormsg {
    color:red;
-}
+}
+
+.hidden {
+   display:none;
+}