13/10/11
  Added ability to use grow_window/shrink_window in grid mode with 3 or 4 windows

13/10/11
  Popup windows now aren't managed/added to the stack

10/10/11
  Reapplied setting master_size relevant to default mode

8/10/11
  For only one window or fullscreen mode there is no border

8/10/11
  Fixed fullscreen mplayer

8/10/11
  Removed useless gaps when in grid mode

16/9/11
  Added back the option to have the panel at the top
  Fine tuned the grid tiling mode

13/9/11
  Added back horizontal tiling, follow mouse and follow window

12/9/11
  Returned to catwm tiling methods - with the ability to resize the window at the top of the stack

9/9/11
   Fine tuned the next/prev desktop and the destroy notify functions

 8/9/11
    Have a proper destroy notify function now that removes destroyed windows from
     the window manager stack for the desktop they were on.