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.
diff --git a/Lib/MimeWriter.py b/Lib/MimeWriter.py
index 9f04656..6aab1cd 100644
--- a/Lib/MimeWriter.py
+++ b/Lib/MimeWriter.py
@@ -10,6 +10,7 @@
import string
import mimetools
+__all__ = ["MimeWriter"]
class MimeWriter: