[Xmonad] darcs patch: rename LayoutHelpers to LayoutModifier. (and 2 more)

Sun Sep 23 17:59:56 EDT 2007 David Roundy <droundy@darcs.net> * rename LayoutHelpers to LayoutModifier. Mon Sep 24 15:34:19 EDT 2007 Andrea Rossato <andrea.rossato@unibz.it> * Added a NewTabbed module with a new tabbed layout to test Tue Sep 25 14:29:30 EDT 2007 David Roundy <droundy@darcs.net> * modifyLayout -> handleMessage.