Make RotView compile.
Make RotView compile.

As I'm not a Xinerama user, I'm not sure if rotView should consider only
hidden workspaces or also visible but not focused workspaces. I thought hidden
workspaces only would be more logical.

darcs-hash:20070522075338-0ff8e-f4b7377272b54540f6ed1d11deaa44bbf590d1b7

jthornber/XMonadContrib,jthornber/XMonadContrib