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.

--- a/Lib/StringIO.py	Sat Jan 20 19:12:54 2001 +0000
+++ b/Lib/StringIO.py	Sat Jan 20 19:54:20 2001 +0000
@@ -34,6 +34,8 @@
 except ImportError:
     EINVAL = 22
 
+__all__ = ["StringIO"]
+
 EMPTYSTRING = ''
 
 class StringIO: