NAME:
  rdphocat
 PURPOSE:
  Read a photometry standard catalog from a file.
 DESCRIPTION:
 CATEGORY:
  File I/O
 CALLING SEQUENCE:
  rdphocat,file,name,mags,codes,filname,nfil
 INPUTS:
  file   - Name of catalog file to read.
 OPTIONAL INPUT PARAMETERS:
 KEYWORD INPUT PARAMETERS:
 OUTPUTS:
  name   - Name of the stars.
  mags   - Stellar magnitudes  (nfil x npts)
  codes  - Quality codes:      (nfil x npts)
            0 - not enough measurements for use as a quality standard.
            1 - good to use as standard
            2 - Known or suspected variable, don't ever use.
  filname- Filter names (string array)
  nfil   - Number of filters
 KEYWORD OUTPUT PARAMETERS:
 COMMON BLOCKS:
 SIDE EFFECTS:
 RESTRICTIONS:
 PROCEDURE:
 MODIFICATION HISTORY:
  96/11/22, Written by Marc W. Buie, Lowell Observatory
  2002/09/03, MWB, changed Str_sep call to strsplit