+ Use `\phantomsection` and `\label` instead of `\hypertarget`.
+ Use `\hyperref` for LaTeX internal links, `\hyperlink` for
beamer (since `\hyperref` doesn't seem to work).
Closes#9022.
We no longer wrap section headings in a `\hypertarget`.
This is unnecessary (hyperref creates an anchor based on the
label) and it interferes with tagging.
In addition, we now use `\hyperref` rather than `\hyperlink`
for internal links.
Currently `\hypertarget` is still being used for link anchors
not on headings.
Closes#8744. Thanks to @u-fischer.
If speaker notes (a Div with class 'notes') occur right
after a section heading, but above slide level, the
resulting `\note{..}` caommand should not be wrapped in
a frame, as that will cause a spurious blank slide.
Closes#7857.
John MacFarlane