Modification to Slice

Its output map is re-initialized instead of being cleared upon a call to reset --for the same reason as the previous commit.

Core/src/ca/uqac/lif/cep/tmf/Slice.java

@@ -1,6 +1,6 @@
 /*
     BeepBeep, an event stream processor
-    Copyright (C) 2008-2022 Sylvain Hallé
+    Copyright (C) 2008-2023 Sylvain Hallé
 
     This program is free software: you can redistribute it and/or modify
     it under the terms of the GNU Lesser General Public License as published
@@ -146,7 +146,7 @@ public Slice duplicate(boolean with_state)
   public void reset()
   {
     super.reset();
-    m_lastValues.clear();
+    m_lastValues = new HashMap<Object,Object>();
   }
 
   @Override