Improve fillData() function in SCT_BytestreamErrorTool
Using set number to check if it is necessary to using the fillData method. We build a m_set_number in Cache structure, recording the latest set number. If we got same set number in the new container then we skip the fillData method to save time, if not, record the new set number in the container and process the fillData method. In this way, we can make the timing performance back to normal, as what it shows in the figure.