project reconfiguration for future
	new file:   Aufgabe1/Aufgabe1.pro
	new file:   Aufgabe1/rationalnumber.cpp
	new file:   Aufgabe1/rationalnumber.h
	new file:   Aufgabe1/testRN.cpp
	deleted:    Aufgabe1/RationalNumber/RationalNumber.pro
	deleted:    Aufgabe1/RationalNumber/rationalnumber.cpp
	deleted:    Aufgabe1/RationalNumber/rationalnumber.h
	deleted:    Aufgabe1/RationalNumber/testRN.cpp