Simple e/pi separation

Using a preshower style cut.

benchmarks/barrel_ecal/config.yml

@@ -61,7 +61,7 @@ collect_results:barrel_ecal:
   extends: .det_benchmark
   stage: collect
   needs: 
-    - ["bench:emcal_barrel_electrons", "bench:emcal_barrel_photons"]
+    - ["bench:emcal_barrel_electrons", "bench:emcal_barrel_photons","bench:emcal_barrel_pions"]
   script:
     - ls -lrht
     - echo " FIX ME"