Add support for multiple workspaces

Everything is in place for multiple workspaces, bar one thing:
the view function. It updates thunk's idea of the current visible
windows, but I don't know how to tell X to hide the current set, and
instead treat the new window list as the only ones visible.

See notes for 'view' at bottom of Main.hs. If we can, say, switch to a
new workspace, which is empty, 'refresh' should spot this only display
the root window.

darcs-hash:20070307111247-9c5c1-eb211e587bc65d7fbc9dfec1ea38364691ef2a67.gz

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