ui parameter support for jQuery enclosed functions

1. jQuery-UI supports second parameter named "ui" in all of his enclosed functions (callbacks).
ATK4 use jQuery-UI a lot, so, we simply need this second parameter in enclosed functions.

2. Updated test cases accordingly.

3. By default tests will put log files in /atk4/tests/log now. Otherwise it's always a reconfiguration job in /tests/config.php when you want to run tests on different platforms (Linux, Windows, etc).
Only drawback of this is, that you have to have write privileges on this folder.