Added options for the persistant support, they're also documented in

  /* This points to a linked list of telnet options */

  CINIT(TELNETOPTIONS, OBJECTPOINT, 70),

  /* Max amount of cached alive connections */

  CINIT(MAXCONNECTS, LONG, 71),

  /* What policy to use when closing connections when the cache is filled

     up */

  CINIT(CLOSEPOLICY, LONG, 72),

  /* Callback to use when CURLCLOSEPOLICY_CALLBACK is set */

  CINIT(CLOSEFUNCTION, FUNCTIONPOINT, 73),

  /* Set to explicitly use a new connection for the upcoming transfer.

     Do not use this unless you're absolutely sure of this, as it makes the

     operation slower and is less friendly for the network. */

  CINIT(FRESH_CONNECT, LONG, 74),

  /* Set to explicitly forbid the upcoming transfer's connection to be re-used

     when done. Do not use this unless you're absolutely sure of this, as it

     makes the operation slower and is less friendly for the network. */

  CINIT(FORBID_REUSE, LONG, 75),

  CURLOPT_LASTENTRY /* the last unusued */

} CURLoption;