Adding some helpers on the main tracking script

	modified:   benchmarks/tracking/central_electrons.sh
	new file:   benchmarks/tracking/scripts/hits_central_electrons.cxx
	modified:   options/tracker_reconstruction.py

	modified:   benchmarks/tracking/scripts/hits_central_electrons.cxx

	modified:   benchmarks/tracking/scripts/hits_central_electrons.cxx

	modified:   options/env.sh