Samples upgraded

I have upgraded all of my sample messages to the point where I think
they are all MIME-conformant as of the December draft.  There are now 22
different sample messages, each in a separate file in the
"pub/nsb/samples" directory on thumper.bellcore.com, retrievable with
anonymous ftp.  Anyone wishing to test the correctness of his/her
implementation (or the correctness of my samples!)  should feel free to
copy these files.  -- Nathaniel