continue enigmail support, just fail closed

"We dropped Enigmail support for now to be able to drop the HTTP proxy requirement." This is really sad.

Alternative solution, perhaps as a stopgap:

• Let Enigmail traffic fail closed.
• Continue to support Engimail, just state that networking features do not work, known limitation.
• Post correct instructions in TorifyHOWTO/GnuPG article.
• Suggest to use gpg command line (correctly torified) to use keyservers.