Add double banking property to LUFA powered projects in the Projects directory. Add guards to macro parameters to ensure that formulas passed as parameters don't mess up the internal macro structure.

Demos/Host/ClassDriver/CDCHost/CDCHost.c

@@ -44,9 +44,14 @@ USB_ClassInfo_CDC_Host_t VirtualSerial_CDC_Interface =
 	{
 		.Config =
 			{
-				.DataINPipeNumber       = 1,
-				.DataOUTPipeNumber      = 2,
-				.NotificationPipeNumber = 3,
+				.DataINPipeNumber           = 1,
+				.DataINPipeDoubleBank       = false,
+
+				.DataOUTPipeNumber          = 2,
+				.DataOUTPipeDoubleBank      = false,
+
+				.NotificationPipeNumber     = 3,
+				.NotificationPipeDoubleBank = false,
 			},
 	};