Implement detector benchmark for the barrel calorimeter for energy resolution

benchmarks/barrel_ecal/scripts/emcal_barrel_energy_scan_analysis.cxx

@@ -167,7 +167,7 @@ std::vector<double> read_scanned_energies(std::string input_energies_fname)
     }
     else
     {
-        std::cout << "Unable to open file" << input_energies_fname << std::endl;
+        std::cout << "Unable to open file " << input_energies_fname << std::endl;
         abort();
     }
 }