added __all__ lists to a number of Python modules

added test script and expected output file as well
this closes patch 103297.
__all__ attributes will be added to other modules without first submitting
a patch, just adding the necessary line to the test script to verify
more-or-less correct implementation.

Lib/binhex.py

@@ -27,6 +27,8 @@ import struct
 import string
 import binascii
 
+__all__ = ["binhex","hexbin","Error"]
+
 class Error(Exception):
     pass