Add information to AT converter for multi-stream input

AT files now contain number of MC events that contributed to a reco event. Besides this just minor updates to LOG output and AT configuration description.

analysis/common/analysis_tree_converter/CbmMatchEvents.cxx

@@ -27,8 +27,8 @@ void CbmMatchEvents::ProcessData(CbmEvent* event)
 {
   if (!event) { throw std::runtime_error("No event to match"); }
 
-  LOG(info) << "Event: " << event->GetNumber() << " t_start " << event->GetStartTime()
-            << " Msts = " << event->GetNofStsTracks();
+  LOG(info) << "Event: " << event->GetNumber() << "  t_start = " << event->GetStartTime()
+            << "  t_end = " << event->GetEndTime() << "  Msts = " << event->GetNofStsTracks();
 
   count_map_.clear();