Store a comment card in a FitsChan
"
Card"
attribute). If
.FALSE., the new card is inserted in front of the current card and the current card is left unchanged. In
either case, if the current card on entry points to the "
end-of-file"
, the new card is appended to the
end of the list. If, on exit, there are no cards following the card written by this function, then the current card is left
pointing at the "
end-of-file"
.