Add support for lzip

[ci-macpaw]

Originally reported on Google Code with ID 296

tobias.bussmann:

it would be nice to add support for the lzip file format. Which is an implementation
of the LZMA algorithm. See: http://lzip.nongnu.org/lzip.html
With this it would be possible to decompress .tar.lz files. Such an sample can be found
here: http://download.savannah.gnu.org/releases/ddrescue/

[ci-macpaw]

paracelsus:

It would be pretty easy to do, but is anyone actually using it for anything? .xz seems
the more popular format, and even that is hardly used (except embedded in other formats
like RPM).