Major overhaul introducing http pipelining support and shared connection

cache within the multi handle.

lib/progress.c

@@ -252,11 +252,11 @@ int Curl_pgrsUpdate(struct connectdata *conn)
          even when not displayed! */
   else if(!(data->progress.flags & PGRS_HEADERS_OUT)) {
     if (!data->progress.callback) {
-      if(conn->resume_from)
+      if(data->reqdata.resume_from)
         fprintf(data->set.err,
                 "** Resuming transfer from byte position %" FORMAT_OFF_T
                 "\n",
-                conn->resume_from);
+                data->reqdata.resume_from);
       fprintf(data->set.err,
               "  %% Total    %% Received %% Xferd  Average Speed   Time    Time     Time  Current\n"
               "                                 Dload  Upload   Total   Spent    Left  Speed\n");