* Moved dependency management to `poetry`.
* Added ability to list the genders assigned to the names.
* Added ability to duplicate the names database for customization.
* Added tools for adding names to a names database.
* Added `mkname_tools` script for administering the names database.
* Explicitly pointing to a non-existent database will no longer
create a new names database in that location.
* Added new API functions that manage the database and configuration
for you.
* More documentation!