Builds the report as text page, using the template page from file.

def make_text_page(self, valumap):
        """
        Builds the report as text page, using the template page from file.
        """
        logger.info('Making a text report page using template %r.', self.text_template)
        fh = open(self.text_template)
        template = fh.read()
        fh.close()
        
        parts = []
        for sr in self.subreports:
            report_data = [item.text for item in sr.report_data if item.text]
            if report_data:
                parts.append('\n{1}\n***** {0} *****\n{1}'.format(sr.title, '*' * (len(sr.title)+12)))
                parts.extend(report_data)

        valumap['subreports'] = '\n'.join(parts) # "\n<<NO SUBREPORT RELATED EVENTS>>\n"
        text_page = Template(template).safe_substitute(valumap)
        return TextPart(fmt='text', text=text_page, ext='txt')