Avoid race condition by manualy setting the island statut on running (Nils Mangelsen)

smp/src/abstractIsland.h

@@ -82,6 +82,11 @@ public:
      */
     virtual bool isStopped(void) const = 0;
     
+    /**
+     * Set the stopped indicator on false
+     */
+    virtual void setRunning(void) = 0;
+    
     /**
      * Receive population by integrate individuals.
      */