[Xmonad] A few patches

[Donald Bruce Stewart]

mgsloan:
> The last 3 are just config tweaks that I think are better.  Pure opinion of course.  
> My config is configured more than this, but these are the ones that I think could be 
> candidates for defaulting.
> 
> The shift cleanup is basically switching the style from using lists as control 
> structures to explicit composition.

Can you resubmit just the properties change, and the new version of
'shift' please.

Also, can you use debug=True for QuickCheck ,to confirm the range of
values being produced, before and after your changes to the properties
file.

-- Don