[issue6715] xz compressor support

[Per Øyvind Karlsen]

Per Øyvind Karlsen <peroyvind at mandriva.org> added the comment:

Hehe, don't feel guily on my part at least, I had already implemented it like this long before. :p

I guess I could rewrite it following these suggestions, but I probably won't be able to finish it in time for 3.2 beta.

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