Changing scribble notation to use TeX-style \ instead of @.
Documentation looks much nicer now (or at least more familiar).
Test cases become ugly because we need to double the escape in
strings.  Also escaping requires \"\\" which in a Scheme string
gets written \\"\\\\".  Consider \\ as a shortcut (which is still
\\\\ in a string).
Allowing an abstract thunk interface to run-net-server.
Adding an interface to socketpair.
Adding additional constants and the ability to set addrinfo hints.
Setting the default hints to AI_PASSIVE so that standard listeners
(including those created implicitly by run-net-server) can listen
on all addresses.
Adding sockaddr-port.