Add optional support for Run ID outside of list in kronos evt macro to later keep only one version

macro/beamtime/mcbm2020/build_event_win_kronos.C

+/*
+ * To use a specific Run ID not in the list, set uRunIdx to 99999 and provide
+ * your desired ID as last parameter.
+ * In all other cases this optional parameter is ignored.
+ */
+
 void build_event_win_kronos(UInt_t uRunIdx = 0,
                             Int_t nEvents  = 0,
-                            TString outDir = "data/") {
+                            TString outDir = "data/",
+                            UInt_t uRunIdIn = 0 ) {
   UInt_t uRunId    = 0;
   TString fileName = "data/unp_mcbm_0.root";
   if (99999 != uRunIdx) {
+    if( 0 != uRunIdIn ) {
+      cout << "Ignored optional Run ID: " << uRunIdIn << endl;
+    } // if( 0 != uRunIdIn )
+
     std::vector<UInt_t> vuListRunId = {
       692, 698, 702, 704, 705, 706, 707,            //  7 =>  0 -  6
       744, 750, 759, 760, 761, 762, 799,            //  7 =>  7 - 13
@@ -27,8 +38,17 @@ void build_event_win_kronos(UInt_t uRunIdx = 0,
     uRunId   = vuListRunId[uRunIdx];
     fileName = Form("data/unp_mcbm_%03u.root", uRunId);
   }  // if( 99999 != uRunIdx )
+    else {
+      uRunId = uRunIdIn;
+    } // else of if (99999 != uRunIdx)
+
+  if (uRunId < 692 && 0 != uRunId) {
+    cout << "Run ID smaller than 692 are not supported in this analysis!"
+         << " Here we have "
+         << uRunId << endl;
+    return kFALSE;
+  } // if (uRunId < 692 && 0 != uRunId)
 
-  if (uRunId < 692 && 0 != uRunId) return kFALSE;
 
 
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