code: static public DataCoding createReservedGroup(byte dcs) {
          return new DataCoding(dcs, Group.RESERVED, CHAR_ENC_DEFAULT, MESSAGE_CLASS_0, false);
      }
docs: Creates a "Reserved" group data coding scheme.  NOTE: this method does
  not actually check if the byte value is reserved, its assumed the caller
  just wants to store the byte value.
  @param dcs The data coding scheme byte value
  @return A new immutable DataCoding instance representing this data coding scheme