#23 Transparency for xfte

[Timo Teras]

Adds virtual transparency support to xfte.

Similar like the one in Eterm (since it mostly ripped
from there)...

There's still some problems when the root windows
background pixmap changes during program execution or
if there's many desktops with different background pixmaps.

Maybe I'll fix them when I get the time.

[Timo Teras]

xfte transparency patch

[Darin]

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To be honest, I'm not sure this is a good idea ... ;-)