This patch makes message-get-reply-headers much easier to read, by
rearranging the logic and adding some comments.  I think it fixes a
bug or two as well, but it's hard to tell, since the old logic is so
hard to understand. :)  Anyway, if I introduced any new bugs or
inadvertently copied some old ones (note the comment "Is this a
bug?"), they should be much easier to fix now.  My paperwork is now on
file with the FSF.


paul