Updated stacking and gravity tiling

Overhauled stacking code and improved hated autotiling
Added by Christoph Kappel almost 6 years ago

In case you haven't noticed yet, I rewrote the stacking code of subtle in r2986. It now keeps the windows on their stacking level and raise/lower just modifies the position on that layer.

Read more about stacking here.

And the second probably unoticed change is the addition of a more flexbile way to enable gravity tiling. Instead of just enabling it globally this can be a) done per gravity now and b) either horizontally or vertically.

Read more about gravity tiling here.