Bug #1030125:  rfc822 __iter__ problem

Add iteration support to the Message class.
diff --git a/Misc/NEWS b/Misc/NEWS
index 3dac4a8..617e815 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -21,6 +21,7 @@
 
 Library
 -------
+- rfc822 Messages now support iteration.
 
 - The (undocumented) tarfile.Tarfile.membernames has been removed;
   applications should use the getmember function.