threaded name resolves.

Robert Marlow reported.

  stuff added a few weeks ago.  Turns out that if you specify --proxy-ntlm and
  communicate with a proxy that requires basic authentication, the proxy
  properly returns a 407, but the failure detection code doesn't realize it
  should give up, so curl returns with exit code 0. Test case 162 verifies
  this.

as a problem serious enough to skip the final QUIT command before closing
the control connection. To avoid the risk that it will "hang" waiting for
the QUIT response. Added test case 161 to verify this.

length limit of the hostname part of the URL.

is now treated as an error by libcurl

with Digest or NTLM. libcurl will now use HEAD to negotiate the authentication
and when done perform the requested POST.

even with authentcations such as NTLM or Digest enabled. Test cases 150, 151
and 152 were added to verify the functionality.

CURLOPT_POSTFIELDSIZE option to allow really big HTTP POSTs.