Allow build_unit_cell to return atom site labels (#38)

* Return additional data with unit cell

* Clean up build_unit_cell

* Test structured array

* Swap back to multi-array return

* Reset default for additional_columns

* Re-enable realspace duplicate check

* Fix format error

* Remove unnecessary TODO

* Fix type hinting in read_cell_params

* Document additional_columns

* Clean up comments

* Clean up docstrings

* Add tests for new functionality

* Fix None formatting in docstrings

* Clean up other docstrings

* Clean up examples and verbose logging

* Fix for python 3.7

* Re-enable parameterized rounding

* Update ChangeLog

Author: janbridley

changelog.rst

@@ -4,6 +4,19 @@ Changelog
 The format is based on `Keep a Changelog <http://keepachangelog.com/en/1.1.0/>`__.
 This project adheres to `Semantic Versioning <http://semver.org/spec/v2.0.0.html>`__.
 
+v0.2.1 - 20XX-XX-XX
+-------------------
+
+Added
+~~~~~
+- New ``additional_columns`` parameter for ``build_unit_cell`` that allows the return of
+  atom site labels and similar data alongside unit cell positions.
+- Ensured consistent ordering of lattice positions returned from ``build_unit_cell``.
+
+Fixed
+~~~~~
+- Type hints now properly link to their associated documentation.
+
 v0.2.0 - 2025-02-19
 -------------------