age.

        Examples
        --------
        Add files to the list of data_files to be included with the package.

            >>> self.add_data_files('foo.dat',
            ...     ('fun', ['gun.dat', 'nun/pun.dat', '/tmp/sun.dat']),
            ...     'bar/cat.dat',
            ...     '/full/path/to/can.dat')                   #doctest: +SKIP

        will install these data files to::

            <package install directory>/
             foo.dat
             fun/
               gun.dat
               nun/
                 pun.dat
             sun.dat
             bar/
               car.dat
             can.dat

        where <package install directory> is the package (or sub-package)
        directory such as '/usr/lib/python2.4/site-packages/mypackage' ('C:
        \Python2.4 \Lib \site-packages \mypackage') or
        '/usr/lib/python2.4/site- packages/mypackage/mysubpackage' ('C:
        \Python2.4 \Lib \site-packages \mypackage \mysubpackage').
        r}