[Xmonad] darcs patch: remove LayoutHooks module (which is unus... (and 2 more)

Here are three cleanup patches that are to modules that I don't maintain, so they're only to be applied if the maintainer agrees, or you think they're obvious improvements. The removal of LayoutHooks is sort of gratuitous, but a helper module with no users seems highly suspect to me. Also, it may be buggy. I haven't reviewed it, but it does the sort of thing that is tricky to get right. David Thu Aug 23 11:45:20 EDT 2007 David Roundy * remove LayoutHooks module (which is unused). Thu Aug 23 11:54:05 EDT 2007 David Roundy * cleanup in ViewPrev. Thu Aug 23 11:54:37 EDT 2007 David Roundy * cleanup in DwmPromote.