ftpfs: reset CURLOPT_VERBOSE
ftpfs: fix some debug outputs
ftpfs: fix curl_put offset access
ftpfs: add curl_dele to allow use of FTP DELE
ftpfs: implement unlink()
ftpfs: implement truncate()
ftpfs: open(): behave according to POSIX
ftpfs: implement flush()
ftpfs: allow O_APPEND in open() as the OS will take care of the offset for us
ftpfs: implemented write()