Added support for [dbiu.de](https://www.datenbanken-im-unterricht.de/catalog.php) databases 1-18 (loaded via [dbiu_databases](https://github.com/ValentinHerrmann/dbiu_databases)) with option to still load DBs from local repo.
Improved docs
**Full Changelog**: https://github.com/ValentinHerrmann/sql_testing_tools/compare/V0.2.4...V0.2.5