Access checks now work, at least for instance data (not for methods

yet).  The class is now passed to eval_code and stored in the current
frame.  It is also stored in instance method objects.  An "unbound"
instance method is now returned when a function is retrieved through
"classname.funcname", which when called passes the class to eval_code.

Python/pythonrun.c

@@ -320,7 +320,7 @@ eval_node(n, filename, globals, locals)
 	freetree(n);
 	if (co == NULL)
 		return NULL;
-	v = eval_code(co, globals, locals, (object *)NULL);
+	v = eval_code(co, globals, locals, (object *)NULL, (object *)NULL);
 	DECREF(co);
 	return v;
 }