Inconsistent use of initial n_errors values across worksheets: sometimes self.n_errors: Optional[int] = None and sometimes self.n_errors: int = 0. Moved to consistently use the second form.
Updated download_gbif_database to pick up older backbone.txt.gz as well as current simple.txt.gz.
This PR fixes two minor things:
n_errorsvalues across worksheets: sometimesself.n_errors: Optional[int] = Noneand sometimesself.n_errors: int = 0. Moved to consistently use the second form.download_gbif_databaseto pick up olderbackbone.txt.gzas well as currentsimple.txt.gz.