PGP support is again working (pyme API has changed significantly) and we

now have a regression test. We now take care that bounce-messages for
incoming encrypted mails or mails where the policy dictates that
outgoing traffic should be encrypted is actually pgp-encrypted. Note
that the new pgp encrypt option for outgoing mails works only for
bounces for now.

git-svn-id: http://svn.roundup-tracker.org/svnroot/roundup/roundup/trunk@4654 57a73879-2fb5-44c3-a270-3262357dd7e2