Fix for the Mf.test_mf_auto_analysis system test on MS Windows.

The Fake_right_click.GetPosition() method now returns a valid position.  This is the original
(10, 10) position.
Fix for a bug introduced at r21202 - the call to the calculate_r2eff() must also be made private.
Fixes for 2 Relax_disp GUI tests to match the model-free fixes of r21182.

The Fake_right_click.GetPosition() method now returns a wx.Point object.