process(): Do no harm to MIME documents when adding the header and

footer.  The rules now are:

- if the message is not a MIME, or is only a text/plain, then add the
  header and footer the old way (concatenation).

- if the message is multipart/mixed, add the header and footer as
  text/plain subparts (prepended and appended to the original
  subparts).

- anything else goes through without headers and footers added.  We
  may elaborate on this last bit in the future.

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