TODO

   1 end-to-end nym-based security
   2 link-level security
   3
   4 try to get the root authorities to set up a secure, usable NS-list system
   5 have dnscache-conf keep track of copies of dnsroots.global
   6 incorporate automatic NS-list upgrades
   7
   8 consider dead-server table in dnscache or in kernel
   9
  10 IPv6 lookups
  11 maybe reverse IPv6 lookups; what a mess
  12 DNS over IPv6