fits_structure - list the structure information of a fits file.
list the structure information of a fits file.
	lay=ref_atm_lay(1);
	ref_atm_lay_fits(lay,"lay");
	fits_structure("lay.fits");
 
    Chen jingyuan, Gan guangyong (IAPCM, Beijing,China.)
fitsinfo , fitsread , fits_head , fits_image_info , get_fits_image , file_fits ,