Also refactors +org-make-last-point-visible-h to be more realistic about
when it should and shouldn't expand the hidden region at point. Since
org-agenda-inhibit-startup is now non-nil by default it makes no sense
to test it (and it was a poor choice to begin with).
Plus, instead of using outline's API, better to use org's, even if
they're aliases or wrappers. Less of a maintenance burden.
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