fix problems with prak5

src/Praktikum/Prak5/Baecker.php

src/Praktikum/Prak5/Bestellung.php

src/Praktikum/Prak5/DB_Classes/Article.php

src/Praktikum/Prak5/DB_Classes/FahrerData.php

src/Praktikum/Prak5/DB_Classes/OrderedArticle.php

src/Praktikum/Prak5/DB_Classes/Ordering.php

src/Praktikum/Prak5/Fahrer.php

src/Praktikum/Prak5/JS/BestellScript.js

src/Praktikum/Prak5/JS/DEPRECATED/OrderData.js

src/Praktikum/Prak5/JS/Kunde.js

src/Praktikum/Prak5/Kunde.php

src/Praktikum/Prak5/Kundenstatus.php

src/Praktikum/Prak5/img/pizzaAfterburner.png

src/Praktikum/Prak5/img/pizzaSalami.png

src/Praktikum/Prak5/img/pizzaVegetaria.png

src/Praktikum/Prak5/index.php