pivot-table: Implement hiding footnotes.

[pspp] / doc / data-io.texi

diff --git a/doc/data-io.texi b/doc/data-io.texi
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 @c PSPP - a program for statistical analysis.
-@c Copyright (C) 2017 Free Software Foundation, Inc.
+@c Copyright (C) 2017, 2020 Free Software Foundation, Inc.
 @c Permission is granted to copy, distribute and/or modify this document
 @c under the terms of the GNU Free Documentation License, Version 1.3
 @c or any later version published by the Free Software Foundation;