Fossil

** ==== Make a backup of your repository before using this command!       ====
**
** ==== FURTHER WARNING: This command is a work-in-progress and may yet   ====
** ==== contain bugs.                                                     ====
**
**   fossil purge artifacts UUID... ?OPTIONS?
**
**      Move arbitrary artifacts identified by the UUID list into the 
**      graveyard.
**
**   fossil purge cat UUID...
**
**      Write the content of one or more artifacts in the graveyard onto
**      standard output.
**
**   fossil purge checkins TAGS... ?OPTIONS?
**
**      Move the check-ins or branches identified by TAGS and all of 
**      their descendants out of the repository and into the graveyard.
**      If TAGS includes a branch name then it means all the check-ins
**      on the most recent occurrence of that branch.
**
**   fossil purge files NAME ... ?OPTIONS?
**
**      Move all instances of files called NAME into the graveyard.