svoid thinAProgramsBackups_v2(S progID, bool doIt) {
  File dir = programDir(progID);
  thinAProgramsBackups_v2(dir, doIt);
}

svoid thinAProgramsBackups_v2(File dir, bool doIt) {
  print("Processing backups in " + dir);
  
  var backupDir = newFile(dir, "backups");
  
  new BackupThinner bt;
  bt.setDir(backupDir);
  bt.scan();
  
  int numDeleted = 0;
  for (File f : bt.deletableFiles) {
    if (doIt) {
      print("Deleting: " + f);
      f.delete();
    } else
      print("Would delete: " + f);
  }
}

Began life as a copy of #1011269