## change / RobustCalibration 0.5.1
  * fixed the bug (appearing on line line 147 in rcalibration()) with an emulator.
  * created rcalibration_MS() and rcalibration_MS class for calibrating mathematical models for multiple sources.
  * created predict_MS() for prediction after calibrating mathematical models
  * created predictobj.rcalibration and predictobj.rcalibration_MS classes for the output for the predict() and predict_MS() function