Alexey Pesternikov introduced CURLOPT_OPENSOCKETFUNCTION and

CURLOPT_OPENSOCKETDATA to set a callback that allows an application to replace
the socket() call used by libcurl. It basically allows the app to change
address, protocol or whatever of the socket. (I also did some whitespace
indent/cleanups in lib/url.c which kind of hides some of these changes, sorry
for mixing those in.)

RELEASE-NOTES

@@ -3,7 +3,7 @@ Curl and libcurl 7.17.1
  Public curl release number:               102
  Releases counted from the very beginning: 128
  Available command line options:           121
- Available curl_easy_setopt() options:     145
+ Available curl_easy_setopt() options:     147
  Number of public functions in libcurl:    55
  Amount of public web site mirrors:        42
  Number of known libcurl bindings:         36
@@ -17,6 +17,8 @@ This release includes the following changes:
  o added --post301 and CURLOPT_POST301
  o builds with c-ares 1.5.0
  o added CURLOPT_SSH_HOST_PUBLIC_KEY_MD5 and --hostpubmd5
+ o renamed CURLE_SSL_PEER_CERTIFICATE to CURLE_PEER_FAILED_VERIFICATION
+ o added CURLOPT_OPENSOCKETFUNCTION and CURLOPT_OPENSOCKETDATA
 
 This release includes the following bugfixes:
 
@@ -48,6 +50,7 @@ This release would not have looked like this without help, code, reports and
 advice from friends like these:
 
  Dan Fandrich, Michal Marek, G<>nter Knauf, Rob Crittenden, Immanuel Gregoire,
- Mark Davies, Max Katsev, Philip Langdale, Alex Fishman, Johnny Luong
+ Mark Davies, Max Katsev, Philip Langdale, Alex Fishman, Johnny Luong,
+ Alexey Pesternikov, Yang Tse
  
         Thanks! (and sorry if I forgot to mention someone)