removed one we won't do, removed the CWD optimize as it is (partly) done

 FTP

 * "PASV IP override" - When an FTPS host is behind a NAT firewall, passive

   mode fails. The PASV response from the host ["227 PASV Entering passive

   mode (_ip_address_, _port_)."] contains the private network IP address of

   the host, which since it is encrypted, cannot be modified by the firewall

   to the public IP address. What is needed is a cURL option to override the

   IP address passed by the host "227 PASV" response. Requested by Ed

   Hingsbergen

 * Support GSS/Kerberos 5 for ftp file transfer. This will allow user

   authentication and file encryption.  Possible libraries and example clients

   are available from MIT or Heimdal. Requsted by Markus Moeller.

 * Optimize the way libcurl uses CWD on each new request over a persistent

   connection (on FTP) even if it doesn't have to.

 * REST fix for servers not behaving well on >2GB requests. This should fail

   if the server doesn't set the pointer to the requested index. The tricky

   part is to figure out if the server did the right thing or not.

   (impossible?) part is to figure out if the server did the right thing or

   not.

 * Support the most common FTP proxies, Philip Newton provided a list

   allegedly from ncftp: