Method getTimeLast

include/DataSet.h:251–262

      }

      bool getTimeLast(const KeyType &ID, double& Timestamp) const
      {
        if(this->checkID(ID))
        {
          Timestamp = std::prev(_DataStreams.at(ID).end())->first;
          return true;
        }
        else
        {
          return false;
        }
      }

      bool getTimeNext(const KeyType &ID, const double Timestamp, double& NextTimeStamp) const
      {