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/codecs.py

@@ -17,6 +17,9 @@ except ImportError,why:
     raise SystemError,\
           'Failed to load the builtin codecs: %s' % why
 
+__all__ = ["register","lookup","open","EncodedFile","BOM","BOM_BE",
+           "BOM_LE","BOM32_BE","BOM32_LE","BOM64_BE","BOM64_LE"]
+
 ### Constants
 
 #