This was a huge PITA because I'm still relatively new to the finer details
of Org Mode. I needed the Slides heading for the columnview table to
properly sum the complete time for the presentation, but in doing so, the
section depth from the headers was off in the exported presentation (unless
I did a subtree export).
I eventually found that there is a contrib package that provides :ignore:,
which solves my problem.
* slides.org
(Slides): Add heading.
(columnview table): Regenerate table.
(Exporting): Add heading.
(Local Variables): Add ox stuff.
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This is a mostly-complete history of the development of my LibrePlanet 2017
talk entitled ``The Surreptitious Assault on Privacy, Security, and
Freedom''. I removed timekeeping and miscellaneous notes/outlines, but it's
otherwise authentic.