Add warnings to and deprecated all those Mac modules
diff --git a/Mac/Modules/Nav.c b/Mac/Modules/Nav.c
index 6786ea0..3d3914f 100644
--- a/Mac/Modules/Nav.c
+++ b/Mac/Modules/Nav.c
@@ -916,6 +916,9 @@
 initNav(void)
 {
 	PyObject *m, *d;
+	
+	if (PyErr_WarnPy3k("In 3.x, Nav is removed.", 1))
+		return;
 
 	/* Test that we have NavServices */
 	if ( !NavServicesAvailable() ) {