Decompressing .tar.xz

[Mihamina Rakotomandimby]

> "Anthony M. Rasat" <anthony.rasat at gmail.com> :
> Me too have never seen an "xz",

Slackware (http://www.slackware.com/) has switched to this xz thing to
compresse their packages:
"
  [...] a new .txz package format with much better compression [...]
"
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