Multiple underscores crash org latex export; other exporters survive

[Scott Otterson <scotto@sharpleaf.org>]

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When an org file contains a string with more than one underscore, the
orgmode export result will crash latex (example attached).   On the other
hand, the org html export does finish successfully, and while result is
odd, it's odd in a way that makes the problem visible and easy to identify.

Many people have orgfiles with heavily underscored code snippets buried
deep inside.  To them, the latex crashes are probably as mysterious as they
were to me.  So I'd like to suggest that the org latex exporter adopt
something like the org html exporter behavior.

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This string below will crash latex:

a_variable_deleteThisAndItWorks

Many people have orgfiles with heavily underscored code snippets buried deep inside.  The latex crashes are probably mysterious.

html export of multple underscores is odd but in a way that makes the problem visible and easy to debug.