Post brot processing steps

With so many files, both rotated and unrotated in the same directory, it can get a bit messy. The following steps are recommended.

1. Make a new directory for the rotated data. For example,
   mkdir brot
2. Move the rotated data to the new directory
   mv brot*.seg brot
3. Clean up the current directory:
      a). remove the list files
   rm -f brot*.lst

      b). gzip the unrotated data to save space
   gzip *.seg

4. Change to the ``brot'' directory, since the next steps are executed on the rotated data.