NAME: 
  rdoccpht
 PURPOSE: 
  Read a Occultation Photometer data file.
 DESCRIPTION:
 CATEGORY:
  File I/O
 CALLING SEQUENCE:
  rdoccpht,file,time,counts,dt,comment
 INPUTS:
  file - String containing filename to read.
 OPTIONAL INPUT PARAMETERS:
 KEYWORD INPUT PARAMETERS:
 OUTPUTS:
  time    - vector of UT time (decimal hours)
  counts  - vector of counts for each time
  dt      - Time spacing between points (seconds)
  comment - string that identifies data (read from header)
 KEYWORD OUTPUT PARAMETERS:
 COMMON BLOCKS:
 SIDE EFFECTS:
 RESTRICTIONS:
 PROCEDURE:
  Data is stored in 512 byte block "records".  The first record is a header
  and contains the following:
      0 -  79  Comment                 (ASCII string)
     80 -  81  clock ticks/second      (integer)
     82 -  83  clock ticks/integration (integer)
     84 -  87  tick # of first point   (long)
     88 -  91  tick # of last point    (long)
     92 -  95  total # of clock ticks  (long)
     96 -  99  total # of data points  (long)
    100 - 101  UT Hours of first tick  (integer)
    102 - 103  UT minutes              (integer)
    104 - 107  UT seconds              (real)
    108 - 511  Null padding 
 MODIFICATION HISTORY:
  95/1/25 - Written by Marc W. Buie, Lowell Observatory