the unavailability of yp servers is much much better now.

- new icecast config option <yp-url-timeout> to specify the timeout

- url encoding is now fixed so that the yp data is formatted much nicer (and is correct :))

- added url encoding for some fields that were not url-encoded

- modified util_dict_urlencode() to not url-encode the key (still does the value)

- new curl option (CURLOPT_NOSIGNAL) which prevents curl from using signals when
  timeouts are hit.  This new option needs curl 7.10 at least.

svn path=/trunk/icecast/; revision=4603