* Enable resize animations
* Fix resizing bladelayout
* Fix panel adjusting (with a workaround)

Turns out it really _was_ needed.

This is completely unnecessary.

This currently does nothing useful (the outline is shown, but flickers
terribly), so don't waste the users CPU.

It is _strongly_ recommended for now to use FocusUnderMouse with this,
as it's otherwise almost impossible to tell which window is focussed.

Should also fix e.g. Firefox resizing.

This needs to be fixed in the other layouts as well

Always set tiling_floating.

This removes any remains of the idea of a "floating tile".
We're not a window manager, we just need to care about tiling windows.

(Also removes superfluous keepBelow setting)

This features full resizing.

This only does one simple special case for the spirallayout (two clients on screen).

Prevents .xsession-errors from getting big.

This is much cleaner than the hodgepodge we had before
and also means e.g. desktopswitching can be handled correctly.

It is now effectively a layout.

This requires a semantics change: addClient can now also deal with already managed clients.

This also fixes a bug with tiling because a method was missing.