[ 1176002 ] Command-Q doesn't exit Boa Constructor (Mac)
[ 1175996 ] Duplicate help menus on the Mac
In addition, preferences and the about menu behave as expected on
Mac OS X.
Note that the last added line "SetMacHelpMenuTitleName('Help')"
would not be necessary if the line above:
as wxPython looks for the string "&Help" to identify the Help menu.
NB: The wx.App.SetMac*-methods should be available even when
not running under Mac OS X.