Add "transfert" feature (don't show tansferts into statistics)

Update package.sh

src/model/User.cpp

@@ -117,3 +117,34 @@ wxLanguage User::GetLanguage()
   
   return (wxLanguage)val;
 }
+
+void User::LinkOrUnlinkOperation(Operation& op)
+{
+  std::vector<Operation>::iterator it;
+
+  // Not Linked
+  if (!op.transfert.Length())
+    {
+      for (it = (*_operations[op.year])[op.month].begin(); it != (*_operations[op.year])[op.month].end(); it++)
+	{
+	  if (it->id != op.id && it->transfert == op.id)
+	    {
+	      it->transfert = wxT("");
+	      return;
+	    }
+	}
+    }
+  // Linked
+  else
+    {
+      for (it = (*_operations[op.year])[op.month].begin(); it != (*_operations[op.year])[op.month].end(); it++)
+	{
+	  if (it->id != op.id && it->id == op.transfert)
+	    {
+	      it->transfert = op.id;
+	      return;
+	    }
+	}
+      op.transfert = wxT("");
+    }
+}