ft_dataskip,ft_dataseek -Fitsy FITS routines to work with the data portion of
a FITS file.
SYNOPSIS
void ft_dataskip(File ifile, FITSHead fits, File ofile); int ft_dataseek(File sfile, FITSHead fits);
Skip over the data part of a FITS header data unit.
If the file is seekable and the ofile file pointer is NULL the data are skipped with an fseek().
If the ofile file pointer is NULL no data is written.
ft_dataseek
Seek to the data portion of prevoiusly read fits header data unit.