  * check keyring for keys without conf and wise versa
  * implement --numcopies
  * implement random hops
    (requires reading stats)
  * check that the last hop is not << 2.4.0
  * check that the last hop supports compressing if we use it
  * think up a nasty license
  * Crypt::Mix::Keyring is a mess. There should probably be a Crypt::Mix::Key too.
    also other code should not access the modules inner structure (like the remailer
    hash)!
