bug(security): fix XSS exploit in devel and responsive templates Replace all occurances of: tal:content="structure context/MUMBLE/plain" with tal:content="context/MUMBLE/plain" This seems to have been an old way to handle display of a field when the user did not have edit rights. It does not occur in current (later than 2009) classic tracker templates. But probably was unsed in earlier classic templates since devel, reponsive and the roundup issue tracker templates were based on classic. Add CVE placeholder to security.txt and link to fix directions added to upgrading.txt. Add note in announcement.txt and CHANGES.txt Add a details element around the table of contents in the upgrading guide. It was getting long. Updated a missed XSS issue in the roundup tracker template. Live site is already fixed. XSS bug reported by 4bug of ChaMd5 Security Team H1 Group

<!--
 This is the default body that is displayed when people visit the
 tracker. The tag below lists the currently open issues. You may
 replace it with a greeting message, or a different list of issues or
 whatever. It's a good idea to have the issues on the front page though
-->
<span tal:replace="structure python:db.issue.renderWith('index',
    sort=[('-', 'activity')], filter=['status'],
    columns=['activity','title','creator'],
    filterspec={'status':['1','2','4']})" />