xmonad: M-m = swap to master
fix M-S-k and M-S-j
xmonad: remove dmenu run prompt
xmonad: M-S-n and M-S-p move current window between screens
Fix M-S-k and M-S-j to rotate *with* the current window
Add three-column layout to rotation
Add infrastructure for IM layout; add default layout for 'mail' workspace