Short-term issues:
* better dest.blk handling (suggested by noise)
* source.alw file/bastion host (suggested by Alex de Joode)
* "strict middleman" configuration (suggested by Antonomasia)
* remove pcre and zlib packages from the mixmaster distribution
  and make necessary changes to the Install script

Long-term issues:
* non-SMTP inter-remailer communication (suggested by Kat)
* graphical Windows user interface
* Mixmaster protocol version 3