General DI liens
================
o Add a prominent explanation of what "Earth Received Time" actually is.

o The DI pipeline at Cornelll is unable to automatically determine
  the proper geometric information, i.e. choice of target, in many cases.
  Thus many of the FITS keywords have 0 entered for pointing information,
  and more importantly for range to the target when it is the comet.
  Clearly we MUST correct, at least in the PDS labels, as many of these keywords
  as possilbe, certainly including the range to the target in ALL products
  where the comet is the target.
  Best approach to be determined by figuring out when the automatic routine
  fails.  Possibly an interpolation will work, possibly running SPICE software
  to calculate the pointing, etc., possibly something else.  This needs science
  input.

o Check refs in reference.cat.  Some are repetitive (AHEARNETAL2005), some
  are published in Icarus 2007 and need updates, and KLAASENETAL2006 needs
  to be updated to 2007.  Need to find every mention of these references
  in all files (example dataset.cat, deep_impact.cat, etc.) and use the
  correct REFERENCE_KEY_ID for them.


DIIV9P_ENC_V2
-------------
o In the dataset.cat, the file naming convention states eeeeee
  instead of iiiiiii.


Validation Liens
----------------
o root directory
	dataset.html - UNIX file, no PDS label

o /index/ directory
	indxinfo.txt - no mention of checksum.* files

o /document/ directory
	pdsdd_di.ful and pdsdd_di.idx - UNIX files 

o /catalog/ directory
	reference.cat - dbl citation - (i.e., AHEARNETAL2005B)