Add support for named destination in PDF/FOP (ID: 3029845)

dear docbook developers,

  I would really appreciate if someone could review my propose changes
to re-activate support for named destination in fop.
  The patch is attached to:

http://sourceforge.net/tracker/?func=detail&atid=373747&aid=3029845&group_id=21935

  I am open to suggestion and/or improvements

thanks !
-- 
Mathieu