adapted analyser.C to Fermilab environment. Draw and save figure to .C and .png file
made analyser.C a standalone executable, rather than a root macro. Including a Makefile (inspired by DC map code). main_script.py is the script to guide the whole chain of producing MC, analysing it and producing chi2 plots.
made main_script.py considerably smaller. All classes are now in separate files: MCTuning_FusedSilicaUVAbs.py and MCTuningBase.py, in which GridSteelRindScale is varied. Reorganized a few things among classes. introduced 'lin' and 'log' for the scale of parameter 1, which is good for scanning and for plotting the chi2 (still to come).