Central moving average and Kalman filters added.
Standard median filter implementation improved (faster & more accurate).
If equal x values found in the input, CSVgraph now allows user to leave them as is or move repeated values slightly so the x values always increase.
Minimum absolute/relative error line fit improved (previously occasionally it would not find the best straight line).
GMR line fit could in rare situations generate a line with the wrong slope – fixed.
Changed to using C++ Builder 12.1 compiler.