[UPDATE 3] RFC: XEmbed System Tray Patches

[James Liggett]

Attached is the third update to the xembed systray patches. For this
version I've simplified the if statements for checking if we should map
tray icon windows or not (As per Scott Ritchie's advice--Thanks again
Scott.) 

As always, further comments/suggestions appreciated.

Thanks,
James Liggett