Setup.in: added tkinter; rearranged the definition of PYTHONPATH so
that the module-specific components are in the section for that
module.

cursesmodule.c: patched it so it actually works.

tkintermodule.c: call Py_AtExit instead of atexit().

signalmodule.c: converted to new naming style; added
BGN/END SAVE around pause() call.

socketmodule.c: added setblocking() after Tommy Burnette.
diff --git a/Modules/_tkinter.c b/Modules/_tkinter.c
index 1f702d3..63a3bf9 100644
--- a/Modules/_tkinter.c
+++ b/Modules/_tkinter.c
@@ -1092,8 +1092,9 @@
   if (!inited)
     {
       inited = 1;
-      if (atexit (Tkinter_Cleanup))
-	PyErr_SetFromErrno (Tkinter_TclError);
+      if (Py_AtExit (Tkinter_Cleanup) != 0)
+	fprintf(stderr,
+		"Tkinter: warning: cleanup procedure not registered\n");
     }
 
   if (PyErr_Occurred ())