project reconfiguration (wrong buildpath!) and implemented next steps,
going to fix last error
	renamed:    Aufgabe1/RationalCollection_1.3/RationalCollection.pro -> Aufgabe1/RationalCollection13/RationalCollection13.pro
	renamed:    Aufgabe1/RationalCollection_1.3/RationalNumberCollection.cpp -> Aufgabe1/RationalCollection13/RationalNumberCollection.cpp
	renamed:    Aufgabe1/RationalCollection_1.3/RationalNumberCollection.h -> Aufgabe1/RationalCollection13/RationalNumberCollection.h
	renamed:    Aufgabe1/RationalCollection_1.3/rationalnumber.cpp -> Aufgabe1/RationalCollection13/rationalnumber.cpp
	renamed:    Aufgabe1/RationalCollection_1.3/rationalnumber.h -> Aufgabe1/RationalCollection13/rationalnumber.h
	renamed:    Aufgabe1/RationalCollection_1.3/testRNC.cpp -> Aufgabe1/RationalCollection13/testRNC.cpp