Rework some i3 layout commands
Rework some i3 layout commands

* z,v now split the parent instead of current window
* shift-z, shift-v split the current window
* remove command to open terminal below, can do this almost as easy with
  above now, with control over split direction.
* e rotates among stacked, tabbed, current-split

ambihelical/dotfiles,ambihelical/dotfiles