- void AddSeriesDetail(uint16_t group, uint16_t elem, bool convert);

 - void AddSeriesDetail(uint16_t group, uint16_t elem, bool convert);
   has a new bool param : convert, to tell wether we want 'convertion',
   to allow further ordering
   e.g : 100 would be *before* 20; 000020.00 vs 00100.00 : OK

 - std::string CreateUserDefinedFileIdentifier( File * inFile );
   allows user to build a Tokenizable and sortable File identifier of his own.
   (user knows more than we do about his files)