tracing doesn't require anymore than maxtem 0 so use that for tracing and then...

tracing doesn't require anymore than maxtem 0 so use that for tracing and then return to previous value.

examples/lkat_trace.py

@@ -4,12 +4,12 @@ cmd = """
 l l1 1 0 n1
 s s1 1 n1 n2
 m m1 0.99 0.01 0 n2 n3
-s s2 100 n3 n4
+s s2 999 n3 n4
 m m2 0.99 0.01 0 n4 n5
 pd circ n3
 
 noxaxis
-maxtem 2
+maxtem 0
 
 attr m1 Rc 0
 attr m2 Rc 1000 

pykat/finesse.py

@@ -1193,10 +1193,17 @@ class kat(object):
             
         trace_info = Manager().dict()
         
+        prev = self.maxtem
+        self.maxtem = 0
+        
+        try:
             p = self.getProcess(f__lkat_trace_callback, trace_info=trace_info)
             p.start()
             p.join()
             
+        finally:
+            self.maxtem = prev
+
         # return a local copy of the trace information dictionary
         return dict(trace_info)