cant add multiple versions
deletes created temp files IF valid update happened
TODO fix delete temp files if update was not successful

I think it is a well working skeleton. Return types are correct. Comments start to tend that way too.

Lehet, hogy célszerű lenne a commit üzeneteket is magyarul írni, ha már a kommenteket is magyarul írjuk.

Added most of the skeleton functionality to the dataAccess package, but it needs some serious reworking

nem tökéletes

note: dont put main method inside of any class

Moved a header file include from the header to the cpp, used a forward declaration instead.