* Remove never read value from code

* Add the possibility to use exec() from FMessageBox to enter and leave the main event loop correctly
* Add a "hello world" example

test/hello.cpp

@@ -0,0 +1,16 @@
+// hello.cpp
+
+#include "fapp.h"
+#include "fmessagebox.h"
+
+
+int main (int argc, char* argv[])
+{
+  // Create the application object
+  FApplication app(argc, argv);
+
+  // Create a simple dialog box
+  FMessageBox mbox(&app);
+  mbox.setText("Hello world");
+  mbox.exec();
+}