Mapping finished

I’ve finished the normalization mapping of the International Nomenclature for Congenital Heart Diseases. The last problem to solve was the uniqueness of the resulting vector, a.k.a. backward compatibility. Every entry from the normalized factors can be now mapped backwards to the old nomenclature. However, inconsistent sets of nomenclature entries will be mapped back only to consistent ones, so it’s kind of a backward-incompatibility.