* released 1.1.17

* released 1.1.17
* add the notion of "backup" servers, which are used only when all other
  servers are down.
* make Set-Cookie return "" instead of "(null)" when the server has no
  cookie assigned (useful for backup servers).
* "log" now supports an optionnal level name (info, notice, err ...) above
  which nothing is sent.
* replaced some strncmp() with memcmp() for better efficiency.
* added "capture cookie" option which logs client and/or server cookies
* cleaned up/down messages and dump servers states upon SIGHUP
* added a redirection feature for errors : "errorloc <errnum> <url>"
* now we won't insist on connecting to a dead server, even with a cookie,
  unless option "persist" is specified.
* added HTTP/408 response for client request time-out and HTTP/50[234] for
  server reply time-out or errors.
* updates to the examples files
* added a 'do_status' command to the Formilux init script