[dwm] save float dimensions patch

Hi all,
  I made a patch that restores all windows to their last floating position when the mode toggles to float.

  The default behavior is to (re)float windows in the location they're currently tiled at. This patch stores windows' last floated dimensions during tile mode and then restores these dimensions when mode is switched back to floating.

  I primarily use float mode, this lets me go into tile mode without losing my window placements.

http://nymu.net/patches/dwm-3.4-save-floats.diff

-Jacob