Add the copyright header to commonConfig.C and remove trailing spaces

Author: sawenzel

Detectors/gconfig/commonConfig.C

@@ -1,3 +1,14 @@
+// Copyright 2020-2022 CERN and copyright holders of ALICE O2.
+// See https://alice-o2.web.cern.ch/copyright for details of the copyright holders.
+// All rights not expressly granted are reserved.
+//
+// This software is distributed under the terms of the GNU General Public
+// License v3 (GPL Version 3), copied verbatim in the file "COPYING".
+//
+// In applying this license CERN does not waive the privileges and immunities
+// granted to it by virtue of its status as an Intergovernmental Organization
+// or submit itself to any jurisdiction.
+
 // common piece of code to setup stack and register
 // with VMC instances
 
@@ -25,7 +36,7 @@ void stackSetup(T* vmc, R* run)
   // register the stack as an observer on FinishPrimary events (managed by Cave)
   bool foundCave = false;
   auto modules = run->GetListOfModules();
-  
+
   if( strcmp(vmc->GetName(), "TGeant4")==0 ) {
     // there is no way to get the module by name, so we have
     // to iterate through the complete list