Archive::Tar::Wrapper is an API wrapper around the 'tar' command line
utility. It never stores anything in memory, but works on temporary
directory structures on disk instead. It provides a mapping between the
logical paths in the tarball and the 'real' files in the temporary
directory on disk.

It differs from Archive::Tar in two ways:
  - Archive::Tar::Wrapper doesn't hold anything in memory. Everything is
    stored on disk.
  - Archive::Tar::Wrapper is 100% compliant with the platform's tar
    utility, because it uses it internally.