Update news for 2012-02-08

Note: this was an unscheduled patch.

Gameplay

Fix: Interference could sometimes cause negative locking times.
Fix: You will not get stuck anymore if you stand on a wall while building it.
New: Defensive walls are now decaying by 3-5 HP every 8 hours and when they reach 0 HP they get destroyed (a fully grown wall has 255 HP).
Change: Weapon damage resistance in walls and plants is now calculated after the sum of all damage types, and not per damage type.