Make it explicit that setting CURLOPT_DIRLISTONLY to 1 will make libcurl
to list the directory.
FTP servers list only files in their response to NLST; they might not include
subdirectories and symbolic links.
+Setting this option to 1 also implies a directory listing even if the URL
+doesn't end with a slash, which otherwise is necessary.
+
Do NOT use this option if you also use \fICURLOPT_WILDCARDMATCH\fP as it will
effectively break that feature then.