fixes 3339

The problem of reproductibility of simulations comes from the hashcode computation of the GamaPopulation (and thus of the agent's hashcode) that depended on the "host" of the population and that can be different between two simulations.

msi.gama.core/src/msi/gama/metamodel/population/GamaPopulation.java

@@ -281,7 +281,13 @@ public GamaPopulation(final IMacroAgent host, final ISpecies species) {
 		} else {
 			mirrorManagement = null;
 		}
-		hashCode = Objects.hash(getSpecies(), getHost());
+
+		/*PATRICK TAILLANDIER: the problem of having the host here is that depending on the simulation the 
+		* hashcode will be different... and this hashcode is very important for the manipultion of GamaMap
+		* thus, having two different hashcodes depending on the simulation makes ensure the repication of simulation
+		* So I remove the host for the moment.
+		*/
+		hashCode = Objects.hash(getSpecies());//, getHost());
 		final boolean[] result = { false, false };
 		species.getDescription().visitChildren(d -> {
 			if (d instanceof ActionDescription && !d.isBuiltIn()) {