Xlsxwriter

-------------------------------

* Fixed issue where custom chart data labels didn't inherit the position of
the data labels in the series. :issue:`754`.

* Added text alignment for textboxes. The existing options allowed the text
area to be aligned but didn't offer control over the text within that area.

* Added Python 3.9 to the test matrix.

---------------------------------

* Added the worksheet :func:`unprotect_range()` method to allow ranges within
a protected worksheet to be unprotected. :feature:`507`.

* There are now over 1500 test cases in the test suite, including 900 tests
that compare the output from XlsxWriter, byte for byte, against test files
created in Excel. This is to ensure the maximum possible compatibility with
Excel.

---------------------------------

* Fixed issue where relative url links in images didn't work. :issue:`751`.

* Added ``use_zip64`` as a constructor option. :issue:`745`.


* Added check, and warning, for worksheet tables with no data row. Either
with or without a header row. :issue:`715` and :issue:`679`.

* Add a warning when the string length in :func:`write_rich_string()` exceeds
Excel's limit. :issue:`372`.

---------------------------------

* Replaced internal MD5 digest used to check for duplicate images with a
SHA256 digest to avoid issues on operating systems such as Red Hat in FIPS
mode which don't support MD5 for security reasons. :issue:`749`.

------------------------------

* Added :func:`ignore_errors()` worksheet method to to allow Excel worksheet
errors/warnings to be ignored in user defined ranges. See also
:ref:`ex_ignore_errors`. :feature:`678`.

* Added warning when closing a file more than once via :func:`close()` to help
avoid errors where a file is closed within a loop or at the wrong scope
level.

-----------------------------

* Added Border, Fill, Pattern and Gradient formatting to chart data labels and
chart custom data labels. See :ref:`chart_series_option_data_labels` and
:ref:`chart_series_option_custom_data_labels`.