Fixed up front matter on the Handbook;

• Remove the <bookbiblio> element, it's not needed
• Added a <copyright> element and sub-elements. Based on the CVS logs the Handbook dates back to 1995.
• Changed the <xref> to a <link> in the abstract.
• Reformatted abstract to be neater (sorry translators, but it's only one paragraph).

This lets the stylesheets generate a nice front page.