zpaq 6.49

[zpaq][z] is an actively developed open source archiver with a long release history and impressive [compression ratios][cr]. It's been packaged in Ubuntu since [12.04 LTS][u].

[z]: http://mattmahoney.net/dc/zpaq.html
[u]: http://packages.ubuntu.com/precise/zpaq
[cr]: http://mattmahoney.net/dc/text.html