Revert "Taken on board suggestions of Mathieu Lirzin as per e-mails to the bug-mcron@gnu.org mailing list around September 2015."

This reverts commit c0a6eb14c257a47e9573631e5ac09e6528fba377.

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-@c The GNU Free Documentation License.
-@center Version 1.3, 3 November 2008
-
-@c This file is intended to be included within another document,
-@c hence no sectioning command or @node.
-
-@display
-Copyright @copyright{} 2000, 2001, 2002, 2007, 2008 Free Software Foundation, Inc.
-@uref{http://fsf.org/}
-
-Everyone is permitted to copy and distribute verbatim copies
-of this license document, but changing it is not allowed.
-@end display
-
-@enumerate 0
-@item
-PREAMBLE
-
-The purpose of this License is to make a manual, textbook, or other
-functional and useful document @dfn{free} in the sense of freedom: to
-assure everyone the effective freedom to copy and redistribute it,
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-Secondarily, this License preserves for the author and publisher a way
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-This License is a kind of ``copyleft'', which means that derivative
-works of the document must themselves be free in the same sense.  It
-complements the GNU General Public License, which is a copyleft
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-We have designed this License in order to use it for manuals for free
-software, because free software needs free documentation: a free
-program should come with manuals providing the same freedoms that the
-software does.  But this License is not limited to software manuals;
-it can be used for any textual work, regardless of subject matter or
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-APPLICABILITY AND DEFINITIONS
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-@item
-MODIFICATIONS
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-@enumerate A
-@item
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-(which should, if there were any, be listed in the History section
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-Preserve in that license notice the full lists of Invariant Sections
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-Include an unaltered copy of this License.
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-@item
-COLLECTIONS OF DOCUMENTS
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-@item
-FUTURE REVISIONS OF THIS LICENSE
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-The Free Software Foundation may publish new, revised versions
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-@item
-RELICENSING
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-``Massive Multiauthor Collaboration Site'' (or ``MMC Site'') means any
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-provided the MMC is eligible for relicensing.
-
-@end enumerate
-
-@page
-@heading ADDENDUM: How to use this License for your documents
-
-To use this License in a document you have written, include a copy of
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-
-@smallexample
-@group
-  Copyright (C)  @var{year}  @var{your name}.
-  Permission is granted to copy, distribute and/or modify this document
-  under the terms of the GNU Free Documentation License, Version 1.3
-  or any later version published by the Free Software Foundation;
-  with no Invariant Sections, no Front-Cover Texts, and no Back-Cover
-  Texts.  A copy of the license is included in the section entitled ``GNU
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-@end group
-@end smallexample
-
-If you have Invariant Sections, Front-Cover Texts and Back-Cover Texts,
-replace the ``with@dots{}Texts.''@: line with this:
-
-@smallexample
-@group
-    with the Invariant Sections being @var{list their titles}, with
-    the Front-Cover Texts being @var{list}, and with the Back-Cover Texts
-    being @var{list}.
-@end group
-@end smallexample
-
-If you have Invariant Sections without Cover Texts, or some other
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-If your document contains nontrivial examples of program code, we
-recommend releasing these examples in parallel under your choice of
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-
-@c Local Variables:
-@c ispell-local-pdict: "ispell-dict"
-@c End: