manual seed option

bind/G4Calo.py

@@ -188,7 +188,8 @@ def run_batch(
         minEnergy_GeV: float,
         maxEnergy_GeV: float = -1.0,
         filename: str = "",
-        no_mp: bool = False):
+        no_mp: bool = False,
+        manual_seed : int = -1):
     '''
     splits the batch in jobs depending on how many cores are available and runs mini batches in parallel
     '''
@@ -215,6 +216,9 @@ def run_batch(
     
     nevents = [nEventsPerCore if i < nCores - 1 else nEventsLastCore for i in range(nCores)]
 
+    if manual_seed >= 0:
+        seed = manual_seed 
+    else:
         with _g4calo_threading_lock if _g4calo_threading_lock is not None else contextlib.nullcontext():
             # check if file exists, if so, read last seed. If not create it
             if os.path.exists(os.path.expanduser("~/.g4calo_seeds.txt")):