[xmonad] Floats always go to the current screen (Patch)

[Robert]

When opening new floating windows on a multihead display, they will 
often unpredictably appear on a different screen to the one that 
currently has focus. Example:

Bind a key to run 'gmrun'. Run gmrun from one screen and take note of 
which screen it appears on. Switch to another screen and do the same 
thing. gmrun will generally appear on the same screen each time.

This seems unpredictable to me. I think new windows should always appear 
on the current workspace (unless it's transient perhaps). This allows me 
to, for example, choose which screen a new window appears on by 
switching to it first. In the current situation, I have to somehow 
remember where X prefers to launch an application and try to arrange my 
workspaces and screens such that the application will appear in the 
right location.

This patch makes new float windows appear on the current screen as I 
think they should. The contrib patch makes contrib compatible with this 
change.

I've undone some of the floating layer work in this patch. It seems the 
floating layer stuff was written explicitly to support the current way 
of placing floating windows. If there were good reasons for this 
functionality, please convince me my patch does the wrong thing. 
Otherwise, I think this patch has the benefit of being more predictable 
and simpler in code.

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