* Some cleaning after r1062 code review.
- Remove code that was never reached.
- Remove a useless function.
- Make GuiPlay treat cards that are both spells and creatures as
creatures and not spells.
* Change inplay balance.
- Spells now stack three by three.
- Spells try to space a little more.
- Creatures and land stack to the left until they hit the big card,
at which point they start displaying more compactly. At some point,
they start using all the screen even if it's under the hand.
