ft_cardins,ft_cardapp,ft_carddel -Fitsy FITS card insert and delete routines.
SYNOPSIS
 
FITSCard ft_cardins(FITSHead fits, FITSCard card, FITSCard here); FITSCard ft_cardapp(FITSHead fits, FITSCard card); FITSCard ft_carddel(FITSHead fits, FITSCard card);
Insert a card into a FITS header after here.
If here is NULL card is inserted before the END card.
 Returns card;
ft_cardapp
Append a card to the end of the FITS header.
 Retuns card.
ft_carddel
Delete a card from a FITS header.
 Returns card which now points the the card after
 the one deleted
EXAMPLES
                FITSCard        here;
                FITSBuff        card;
        ft_cardkey(&card, "Keyword", 0);
        ft_cardseti(&card, 4, NULL);
        /* Insert a new card "Keyword" after the 4th card.
         */
        here = ft_cardins(fits, &card, ft_cardnth(4));
        /* Append the same card to the header
         */
        card = ft_cardapp(fits, &card);
        /* Delete the first card.
         */
        ft_carddel(fits, here);