def subreporter(self, subpath, entry):
        """
        create a reporter for a sub-report, with updated breadcrumbs and
        the same output formats
        """

        newbase = join(self.basedir, subpath)
        r = Reporter(newbase, entry, self.options)

        crumbs = list(self.breadcrumbs)
        crumbs.append((self.basedir, self.entry))
        r.breadcrumbs = crumbs

        r.formats = set(self.formats)
        return r
create a reporter for a sub-report, with updated breadcrumbs and
        the same output formats