A couple of bug fixes:
 - qcrp.CalculateNEE was leaving all NEE series as -9999 because the
   comparison Fsd>Fsd_threshold wasn't working.  This wasn't
   working because I recently changed a direct read of the cf
   object to one done via qcio.get_keyvalue_from_cf which returns
   a string causing the floating point comparison to fail.
 - can't remember what I did to qcio