FMSLogo Code

I had been fixing this class of bug by using the wxSTAY_ON_TOP style for each of the dialog boxes that a Logo command can create, but ran into a problem in DIALOGFILEOPEN where this had no effect (the dialog isn't a real wxWidgets dialog box, but a proxy to a common control). After some experimentation, I settled on a new strategy, which is to lower the screensaver window so that any windows created after it would be on top of it.