Adapt memory query to support current NEST release

multiarea_model/simulation.py

@@ -311,7 +311,10 @@ class Simulation:
         """
         Use NEST's memory wrapper function to record used memory.
         """
-        mem = nest.sli_func('memory_thisjob')
+        try:
+            mem = nest.sli_func('memory_thisjob')
+        except AttributeError:
+            mem = nest.ll_api.sli_func('memory_thisjob')
         if isinstance(mem, dict):
             return mem['heap']
         else: