Some more work on the MT UI

- tenant database setup can be preconfigured
- site setup UI reflects available settings (e.g. if database setup is preconfigured then don't show db options)
- updated jQuery from 1.4.1 to 1.4.2 (finally)

--HG--
branch : dev

src/Orchard.Web/Modules/Orchard.Themes/Views/HeadPreload.ascx

@@ -3,6 +3,6 @@
 // a CSS file for styling things (e.g. content item edit buttons) for users with elevated privileges (in this case, anyone who is authenticated)
 if (Request.IsAuthenticated) { Html.RegisterStyle("special.css"); }
                                                                           
-Html.RegisterScript("jquery-1.4.1.js"); // <- change to .min.js for use on a real site :) 
+Html.RegisterScript("jquery-1.4.2.js"); // <- change to .min.js for use on a real site :) 
 Html.RegisterFootScript("base.js");
 %>