Fossil

**      Write the content of one or more artifacts in the graveyard onto
**      standard output.
**
**   fossil purge ?checkins? TAGS... ?OPTIONS?
**
**      Move the check-ins identified by TAGS and all of their descendants
**      out of the repository and into the graveyard.  The "checkins"
**      subcommand keyword is option and can be omitted as long as TAGS
**      subcommand keyword is optional and can be omitted as long as TAGS
**      does not conflict with any other subcommand.
**
**      If a TAGS includes a branch name then it means all the check-ins
**      If TAGS includes a branch name then it means all the check-ins
**      on the most recent occurrance of that branch.
**
**           --explain         Make no changes, but show what would happen.
**           --dry-run         Make no changes.
**
**   fossil purge list|ls ?-l?
**