Log Message:
Update to 4.2.0.  Notable changes:

  * --tray-overlay option added - use this to overlay a EPS file onto the
      tray, for example, a barcode image.
  * cdinsert.pl now used to display initial form, as well as a
    filled-in form to allow for easy corrections/resubmits on the done page.
  * Create covers for double-sided DVD cases that hold 6 DVDs.
  * cdinsert.pl now supports "Omit title/subtitle from Cover" option.
  * Support for double-depth slim DVD cases. --slim-double-case option added.