rip command tree
----------------
rip
  offset
    find
      find drive's read offset using AccurateRip
    verify
      verify drive's read offset using AccurateRip
  cd
    rip
      rip the cd
  htoa
    find
    rip
      rip the htoa if it's there
  image
    verify
      verify the cd image

style guide
-----------

To avoid confusion:

 - cuefile is used for the CueFile object, which wraps/parses an existing .cue
   file on disk
 - tocfile: same
 - toc: table of contents of a CD; instance of Table