heading line cycles the whole buffer between "only top-level
headings", "all headings and subheadings", and "show all" states.
+---
*** New user option 'outline-minor-mode-highlight'.
This user option customizes 'outline-minor-mode'. It puts
highlighting on heading lines using standard outline faces. This
works well only when there are no conflicts with faces used by the
major mode.
++++
** New commands 'copy-matching-lines' and 'kill-matching-lines'.
These commands are similar to the command 'flush-lines',
but add the matching lines to the kill ring as a single string,