[Usability]fullscreen mode

[Havoc Pennington <hp redhat com>]

Hi,

Various apps such as Galeon have a "fullscreen mode."

This can be done in the window manager window menu, but my misgivings
are:
 - it adds yet another thing to the window menu
 - if you don't know about Alt+rightclick to get a window 
   menu on the client area, you can't get out of fullscreen 
   mode once you're in it
 - it probably doesn't make sense for some apps 
   (though it could of course be insensitive for non-resizable windows)

It can also be done in the app as it usually is now, the possible down
side is less consistency.

I did it in the app for now, in gnome-terminal. But I thought I'd
troll for opinions anyhow. ;-)

Havoc