Add `truncate` option to subscription commands

When Who What
2020-11-25 18:44:12 David Christensen (davidchristensen) Closed in commitfest 2020-11 with status: Withdrawn
2020-11-09 10:55:13 Anastasia Lubennikova (lubennikovaav) New status: Waiting on Author
2020-10-09 19:13:22 David Christensen (davidchristensen) Changed authors to David Christensen (davidchristensen)
2020-10-09 19:13:22 David Christensen (davidchristensen) Changed targetversion to 14
2020-10-09 19:13:03 David Christensen (davidchristensen) Attached mail thread CF3B6672-2A43-4204-A60A-68F359218A9B@endpoint.com
2020-10-09 19:13:03 David Christensen (davidchristensen) Created patch record