Xlsxwriter

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* Fix for missing `remove_timezone` option in Chart class. :pull:`404` from
Thomas Arnhold.

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* Added user definable removal of timezones in datetimes. See the
:func:`Workbook` constructor option ``remove_timezone`` and :ref:`Timezone
Handling in XlsxWriter <timezone_handling>`. :issue:`257`.

* Fix duplicate header warning in :func:`add_table` when there is only one
user defined header. :issue:`380`.

* Fix for `center_across` property in :func:`add_format`. :issue:`381`.

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* Added check to :func:`add_table` to prevent duplicate header names which
leads to a corrupt Excel file. :issue:`362`.

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* Added workbook :func:`set_size` method to set the workbook window size.

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* Added font support to chart :func:`set_table`.

* Documented used of font rotation in chart :ref:`data labels
<chart_series_option_data_labels>`. :issue:`337`.

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* Added :ref:`trendline properties <chart_series_option_trendline>`:
``intercept``, ``display_equation`` and ``display_r_squared``.
:feature:`357`.