added origin island rank member

propulate/population.py

@@ -59,6 +59,7 @@ def __init__(
 
         self.generation = generation  # Equals each worker's iteration for continuous population in Propulate.
         self.rank = rank
+        self.island_rank = -1
         self.loss = None  # Set to None instead of inf since there are no comparisons
         self.active = True
         self.island = -1  # island of origin