Z:gnu-www-ja-ftp--f0a8a9-Various compression formats ar/en

Various compression formats are used on the server: .gz is gzip (http://gnu.org/software/gzip); .bz2 is bzip2 (http://bzip.org); .xz is xz (http://tukaani.org/xz); .lz is lzip (http://lzip.nongnu.org/lzip.html).