Store a comment card in a FitsChan astSetFitsCM
"
Card"
attribute). If zero,
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"
.