RootDataIO has become a namespace with a read and write function only
Output file is updated by default, not overwritten
Tests and executables have been modified accordingly
EventDataStructure was meant as a container for ROOT's TChain, but it does not perfectly behave as a class for ROOT issues with re-assigning branch addresses
EventDataStructurewas meant as a container for ROOT'sTChain, but it does not perfectly behave as a class for ROOT issues with re-assigning branch addresses