Yet another resolve code re-org

                                  Changelog

Daniel (24 June 2004)

- Major reorganization in the host resolve code (again). This time, I've

  modified the code to now always use a linked list of Curl_addrinfo structs

  to return resolved info in, no matter what resolver method or support that

  is available on the platform. It makes it a lot easier to write code that

  uses or depends on resolved data.

  Internally, this means amongst other things that we can stop doing the weird

  "increase buffer size until it works" trick when resolving hosts on

  ipv4-only with gethostbyname_r(), we support socks even on libcurls built

  with ipv6 enabled (but only to socks servers that resolve to an ipv4

  address) and we no longer deep-copy or relocate hostent structs (we create

  Curl_addrinfo chains instead).

  The new "hostent to Curl_addrinfo" converter function is named Curl_he2ai()

  and is slightly naive and simple, yet I believe it is functional enough to

  work for libcurl.

Daniel (22 June 2004)

- David Cohen pointed out that RFC2109 says clients should allow cookies to

  contain least 4096 bytes while libcurl only allowed 2047. I raised the limit