Clear the sentMessages container in Island and IslandModel in order to use the model more than once (Nils Mangelsen)

smp/src/island.cpp

@@ -68,6 +68,9 @@ void paradiseo::smp::Island<EOAlgo,EOT,bEOT>::operator()()
     // Let's wait the end of communications with the island model
     for(auto& message : sentMessages)
         message.join();
+    
+    // Clear the sentMessages container
+    sentMessages.clear();
 }
 
 template<template <class> class EOAlgo, class EOT, class bEOT>

smp/src/islandModel.cpp

@@ -99,6 +99,9 @@ void paradiseo::smp::IslandModel<EOT>::operator()()
     for(auto& message : sentMessages)
         message.join();
         
+    // Clear the sentMessages container
+    sentMessages.clear();
+        
     // Force last integration
     i = 0;
     for(auto it : islands)