fix dla głównego Makefile
fix dla głównego Makefile

JPETTomography/j-pet-framework-examples,wkrzemien/j-pet-framework-examples,wkrzemien/j-pet-framework-examples,JPETTomography/j-pet-framework-examples,wkrzemien/j-pet-framework-examples,JPETTomography/j-pet-framework-examples,JPETTomography/j-pet-framework-examples