less space used by the options, automatic sub-folder detection even for
single folder archive and handling of dot (".") as the returned sub-folder
name by the archive list job (libarchive quirck).
tested batch and non-batch extraction, with and without automatic
sub-folder detection but with tar.xz and .deb files only
Signed-off-by: Ivailo Monev <xakepa10@gmail.com>