ftp/tnftp 20230507 MidnightBSD

`tnftp' (formerly lukemftp) is what many users affectionately call the enhanced ftp client in NetBSD.

The enhancements over the standard ftp client in 4.4BSD include: * command-line editing within ftp * command-line fetching of URLS, including support for: - http proxies (c.f: $http_proxy, $ftp_proxy) - authentication * context sensitive command and filename completion * dynamic progress bar * IPv6 support (from the WIDE project) * modification time preservation * paging of local and remote files, and of directory listings (c.f: `lpage', `page', `pdir') * passive mode support, with fallback to active mode * `set option' override of ftp environment variables * socks4/socks5 support * TIS Firewall Toolkit gate ftp proxy support (c.f: `gate') * transfer-rate throttling (c.f: `-T', `rate')