- Rewrite the IPv6 library to accept/handle IPv4-only connections
  transparently.
  - Use a prefix of ::4444/32 to distinguish from ::ffff/32 and ::0/32

- Add Jenkin's lookup3 hash http://burtleburtle.net/bob/hash/doobs.html
  - Replace adt_hashb, or add some other library of hash functions
  - What about FNV or other good ones?

- Add make-compile, make-load, make-makelib scripts

- exec replacement?  http://cr.yp.to/lib/pathexec.html

- More ADTs: bag/set, tree

- Add tests to adt/queue, adt/stack
