Importing liblzma, xz

[Tim Kientzle]

Since there were some more questions about this
recently on -hackers, I figured I should go ahead
and start the process on this.

I believe -arch is the correct place to ask:

Does anyone have any concerns about importing
the liblzma libraries and associated command-line
tools from Lasse Collin's "xz utils"
package into FreeBSD's base system?

The code in question is all currently in the
public domain, so there should be no problems
with licensing.

More information about the xz project:
   http://tukaani.org/xz/

According to that page, the final 5.0 production
version should be released pretty soon.

Cheers,

Tim