Rivers in Luxembourg quiz (FlessQuiz).
Description: This quiz deals with the 15 main rivers in my country; the GUI (as well as all names)
are in Luxembourgish. 5 sets of questions are available in the "Froën" menu: source country or town/village, destination
country, town/village or river. Answers may be given in 2 ways: by selecting them in a list ("Auswielen") or, the more difficult
way to do the quiz, by entering them directly from the keyboard, no list being displayed in this case ("Aginn").
Free Pascal features: Reading a text file (classic Pascal); filling a combobox with data read from a
file; complex Pascal data structures.