Code review comment for lp:~sergei.glushchenko/percona-xtrabackup/20-decompress

I have three thoughts:
- Should we add this to 2.0 at all? It is adding a feature and a 2.1 release probably isn't far off.
- I think that certainly in 2.1, this should be default behaviour, as it's almost certainly what the user wanted.
- parallel decompression?