Slides PDF foilgroup titlepage problems

Hi,

It appears that slides/fo/plain.xsl produces foilgroup title pages
that display the foilgroup title twice, once as fo:static-content by
the foil page master, and then as block content in inverted colors by
the foilgroup.titlepage template.

The appearance of the static-content title is probably a bug.

As a quick fix, which might actually make some sense, I changed the
select.user.pagemaster to use the slides-titlepage page master for
foilgroups (instead of the foil page master).

It would be nice to have the option of disabling foilgroup title pages
altogether, but I did not find a simple way of doing this without
flattening the hierarchical PDF bookmark structure.

This is with Fop 0.94.

Thanks,
Justus