obsoleted curl_formparse -> curl_formadd
	maybe.. Needs new Class, not easy.

really need files? (file, writeheader....)
	can use Ruby String instead.

not clear POST GET state...

keep body_str header_str in 'iv'


# use iv_set
# remove hash (prms)
# remove MUTE NOPROGRESS
# obsolete CURLOPT_POST
# data->set.upload
