Log Message:
Update p5-XML-Writer to 0.601.

Changes:
0.601 Fri Sep  1 15:01:45 BST 2006    <joe@kafsemo.org>
        - Don't modify list references passed as tag or attribute names
           (cpan #14854).

0.600 Thu Jun 30 23:17:00 BST 2005    <joe@kafsemo.org>
        - Don't include an encoding in the XML declaration unless one
           is specified.
        - Check for, and croak on, invalid characters (including ASCII NUL).
        - Fixed 'ancestor' with out-of-bounds indexes.

0.545 Mon May 16 08:11:17 BST 2005    <joe@kafsemo.org>
        - Format comments like elements when in data mode.
        - Only attempt Unicode tests for Perl >= 5.8.1.

0.540 Tue May 10 18:18:58 BST 2005    <joe@kafsemo.org>
        - Don't die when ENCODING is specified with a scalar OUTPUT.
        - Add support for US-ASCII encoding.

0.531 Mon Mar 14 22:11:33 GMT 2005    <joe@kafsemo.org>
        - Rename internal String package to avoid clash with external modules.
        - Fix Unicode test skipping for Perls before 5.8.