add bm-lifo-previous and bm-lifo-next function.
that means goto previous or next bookmark in LIFO order .
(that is, most recently set ones come first, oldest ones come last)

bm-show bm-show-all bm-next and bm-previous support bm-in-lifo-order option
and old bm-next and bm-previous are renamed to bm-common-next bm-common-next