Mime encryption support

[Kevin B. <kb...@gm...>]

Hi all,

here I send you a patch for Mime support according to Rfc 3156 for
Mailcrypt. *This is an incomplete alpha version!* The reason I mail it
here is that I don't see when I will find the time to finish it. Maybe
someone else does.

It currently only works for Gnus. For other MUAs some changes to
mc-toplev.el are necessary. I only tested gpg, interactions with Mutt
and itself ;-)

Some things that still need to be done or fixed:

- add support MUAs other than Gnus
- Bug if the Mime boundary in the header is not enclosed in quotes: a
  better regexp or a cond clause has to be used
- when decrypting one superfluous newline is added between header and
  body
- variables like mc-gpg-signed-begin-line have to be inserted for pgp
  too, or they have to be hardcoded or maybe something completely
  different
- testing, testing, testing...

If someone is willing to help, please let me know.

Kevin

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