Move the __getitem__() definition from StandardException to Exception.

This allows stuff like this out of the box:

	try:
	    ...
	except socket.error, (code, msg):
	    ...

Lib/exceptions.py

@@ -58,10 +58,12 @@ class Exception:
 	else:
 	    return str(self.args)
 
-class StandardError(Exception):
     def __getitem__(self, i):
 	return self.args[i]
 
+class StandardError(Exception):
+    pass
+
 class SyntaxError(StandardError):
     filename = lineno = offset = text = None
     msg = ""