Added CMS_RESPONSE.request_url (...)

Update a few callers of CMS_RESPONSE.url (...).
Renamed the demo files using "server" instead of "demo".

modules/admin/handler/cms_admin_cache_handler.e

@@ -89,7 +89,7 @@ feature -- Widget
 		local
 			but: WSF_FORM_SUBMIT_INPUT
 		do
-			create Result.make (a_response.url (a_response.location, Void), "form_clear_cache")
+			create Result.make (a_response.request_url (Void), "form_clear_cache")
 			create but.make_with_text ("op", text_clear_all_caches)
 			Result.extend (but)
 		end