Socket efuns

These efuns allow TCP and UDP sockets to be created, allowing the MUD to
create internet connections other than its login ports.

<DL>

*  socket_accept
*  socket_acquire
*  socket_address
*  socket_bind
*  socket_close
*  socket_connect
*  socket_create
*  socket_error
*  socket_listen
*  socket_release
*  socket_write
</DL>

 Tim Hollebeek  Beek@ZorkMUD, Lima Bean, IdeaExchange, and elsewhere