returning local copy of dict

examples/lkat_trace.py

@@ -11,7 +11,7 @@ pd circ n3
 noxaxis
 maxtem 2
 
-attr m1 Rc -1000
+attr m1 Rc 0
 attr m2 Rc 1000 
 cav c1 m1 n3 m2 n4
 """

pykat/finesse.py

@@ -1169,7 +1169,8 @@ class kat(object):
         p.start()
         p.join()
 
-        return trace_info
+        # return a local copy of the trace information dictionary
+        return dict(trace_info)
     
     def __add_detector(self, det):