NAME:
  nofile
 PURPOSE:   (one line only)
  Validate the existence of a file
 DESCRIPTION:
 CATEGORY:
  Utility
 CALLING SEQUENCE:
  val = nofile(file,desc)
 INPUTS:
  file - name of a file to check.  This can a relative or absolute
           reference.
  desc - String to print out with the message if the file does not exist.
 OPTIONAL INPUT PARAMETERS:
 KEYWORD INPUT PARAMETERS:
 OUTPUTS:
  Return value is true (1) if the file is missing.  False (0) if it exists.
 KEYWORD OUTPUT PARAMETERS:
 COMMON BLOCKS:
 SIDE EFFECTS:
 RESTRICTIONS:
 PROCEDURE:
 MODIFICATION HISTORY:
  Written by Marc W. Buie, Southwest Research Institute, 2020/03/26