project. Also added a few obvious ones.

CURLOPT_COOKIELIST, which then makes all session cookies get cleared. (slightly
edited by me, and the re-indent in cookie.c was also done by me)

autotools project, which optionally (default=yes) uses libcurl on a system
without a (usable) libcurl installation, but not specifying
`--without-libcurl', configure determines correctly that no libcurl is
available, however, the LIBCURL variable gets expanded to `LIBCURL = -lcurl'
in the resulting Makefiles.

David Shaw fixed the flaw.

thus works reliably on more platforms.

transfers. They are done on non-windows systems and translate CRLF to LF.

  This happens because the multi-pass code abuses the redirect following code
  for doing multiple requests, and when we following redirects to an absolute
  URL we must use the newly specified port and not the one specified in the
  original URL. A proper fix to this would need to separate the negotiation
  "redirect" from an actual redirect.

type to the already provided type CURLPROXY_SOCKS4.
I added a --socks4 option that works like the current --socks5 option but
instead use the socks4 protocol.