Newznab providers will be compared based on url, not name.

Built-in Newznab providers cannot be deleted (they would be re-added anyways), nor can the URL be changed.

NzbDrone.Core/Repository/NewznabDefinition.cs

@@ -16,5 +16,7 @@ namespace NzbDrone.Core.Repository
         public String Url { get; set; }
 
         public String ApiKey { get; set; }
+
+        public bool BuiltIn { get; set; }
     }
 }