QMessageBox displays modal dialogs which blocks the gui tests.
To work around this we add a MessageBox wrapper class where
the tests can set the answer for the next dialog.
The answer is then returned without actually showing the dialog.
This gives the option to reload the database.
TODO:
- Settings for reloadBehavior (ask, reloadUnchanged, ignore)
- Improve notification, by using a header instead of dialog: nicer, less
intrusive, gives more options to user, and works better when multiple databases
are open.
- Keep tab order on reload.
