Beamer template: fix incompatibility of section slides with natbib.

Natbib (and presumably biblatex) bibliography commands create
their own section.  Since these are in frame environments,
we have an incompatibility with the `\AtBeginSection` macro
which creates a special frame when a new section occurs.
(We can't have a frame inside another frame.)

This change disables `\AtBeginSection` inside bibliography
slides.

This supersedes #145.  See discussion tehre.

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