[web2py] Minor optimize: skip superfish when possible

[Ray (a.k.a. Iceberg)]

Hey folks,

I just use this little trick in my app, to reduce two unnecessary http
requests when menus are not needed.

I think the optimization is reasonable. And people can always manually
re-enable superfish by response.files.extend([...]). So, my proposal
is to put this into the default welcome (scaffold) app. Shall we?

diff -r 483ebd275b49 views/layout.html
--- a/views/layout.html Mon Dec 26 23:19:42 2011 +0800
+++ b/views/layout.html Mon Dec 26 23:26:26 2011 +0800
@@ -39,8 +39,10 @@

     {{#------  require CSS and JS files for this page (read info in
base.css) ------}}
     {{response.files.append(URL('static','css/base.css'))}}
-    {{response.files.append(URL('static','css/superfish.css'))}}
-    {{response.files.append(URL('static','js/superfish.js'))}}
+    {{if response.menu:}}
+        {{response.files.append(URL('static','css/superfish.css'))}}
+        {{response.files.append(URL('static','js/superfish.js'))}}
+        {{pass}}
     {{#------ include web2py specific js code (jquery, calendar, form
stuff) ------}}
     {{include 'web2py_ajax.html'}}