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/anydbm.py

@@ -42,6 +42,8 @@ only if it doesn't exist; and 'n' always creates a new database.
 
 """
 
+__all__ = ["error","open"]
+
 try:
     class error(Exception):
         pass