Add a paragraph about CURLOPT_CUSTOMREQUEST not actually changing libcurl's

Pass a curl_off_t as parameter. It contains the offset in number of bytes that

you want the transfer to start from. (Added in 7.11.0)

.IP CURLOPT_CUSTOMREQUEST

Pass a pointer to a zero terminated string as parameter. It will be user

Pass a pointer to a zero terminated string as parameter. It will be used

instead of GET or HEAD when doing an HTTP request, or instead of LIST or NLST

when doing an ftp directory listing. This is useful for doing DELETE or other

more or less obscure HTTP requests. Don't do this at will, make sure your

server supports the command first.

Note that libcurl will still act and assume the keyword it would use if you

didn't set your custom one is the one in use and it will act according to

that. Thus, changing this to a HEAD when libcurl otherwise would do a GET

might cause libcurl to act funny, and similar. To switch to a proper HEAD, use

\fICURLOPT_NOBODY\fP, to switch to a proper POST, use \fICURLOPT_POST\fP or

\fICURLOPT_POSTFIELDS\fP and so on.

Restore to the internal default by setting this to NULL.

Many people have wrongly used this option to replace the entire request with