Added MCheader info and (event-wise) mc-core position to the the output produced by hillas_preprocessing_MAGICCleaning_stereo.py
Added MCheader info and (event-wise) mc-core position to the the output produced by hillas_preprocessing_MAGICCleaning_stereo.py. The MCheader info (e.g.: corsika energy range, spectral index, max impact, viewcone or equivalent,...) are useful for IRF calculation.