ROOT7 classes

Interfaces and classes designed for future ROOT version 7.

Files
file	RError.cxx
file	RLogger.cxx
file	RLogger.hxx
file	RNTupleDS.hxx
file	RNTupleExporter.cxx
file	RNTupleExporter.hxx
file	RNTupleImporter.cxx
file	RNTupleImporter.hxx
file	RNTupleInspector.cxx
file	RNTupleInspector.hxx