ftpfs: implement rmdir()
ftpfs: check FEAT for MLST support and enable full MLS(D/T) output
ftpfs: open(): accept O_NONBLOCK
ftpfs: add ftp_url parameter to give everything in one line
support direct passing of ipv4/ipv6 addrs
ftpfs: for now, quit when the server can't do MLST
ftpfs: rewrite of curl_inband_cmd to support a sequence of commands needed to run directly after each other without server reconnection
ftpfs: implement rename()
ftpfs: fix various printf()s
ftpfs: fix mkdir()
ftpfs: proper display of nested arrays in compact_pa