wrote function to fit the peak on a histo, there is no need for a class for that
fixed errors, added tcanvas to avoid warnings
added program to test the fitting procedure
added variables to steer fit range
improved test
modified return value if the histo is not there
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splitted the function in declaration and implementation to avoid problems in the linking
added file with constants for the program
added class to do calibrations at fixed temperature
added program to do calibration at single temperature