Xlsxwriter

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* Fix for ``autofit()`` exception when user defined column width was ``None``.

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* Improved :func:`autofit` algorithm to account for the additional width of
autofilter and table dropdowns.

* Improved :func:`autofit` take user defined column widths into account.

Autofit will now only update the width for an existing column if it is greater
than the user defined value. This allows the user to pre-load a minimum column
width.

:feature:`936`.

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* Added simulated worksheet :func:`autofit` method.

:feature:`936`.

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* Added ``OverlappingRange`` exception which is raised during Worksheet
:func:`add_table()` or :func:`merge_range()` if the range overlaps an existing
worksheet table or merge range. This is a file corruption error in Excel. See
:ref:`exceptions`.

:issue:`848`

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* Roll up release of several minor fixes.

* Drop support for EOL Python 3.4 and 3.5.

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* Added :func:`print_black_and_white` worksheet method to set "Black and
White" print options.

:feature:`862`.