allout-back-to-heading is an alias for `allout-back-to-current-heading' in `allout.el'.

(allout-back-to-heading &optional INTERACTIVE)

Move to heading line of current topic, or beginning if not in a topic.

If interactive, we position at the end of the prefix.

Return value of resulting point, unless we started outside
of (before any) topics, in which case we return nil.