Minecraft Snapshot 12w27a

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• Performance improvements, including reduced CPU, RAM & bandwidth requirements.
• Updated Pistons to make them less error-prone, thus they also appear to update slower. This also altered the way Pistons work, so you might have to adapt your repeater delays and similar.
• Added /debug <start|stop> command.
• Signs are stackable up to 16.
  • Crafting them now gives 3 signs instead of 1 with the same recipe.
• Creative mode inventory now shows potion effects.
• Boats now drop the boat item when destroyed.
• Gaining Experience from mining ore is now different for each type of ore. (Mining Coal will give you the least amount while Diamond Ore & Emerald Ore will give the most amount of XP).
• Fortune enchantments no longer affect Experience drop rates
• The Debug (F3) Pie chart now shows the game rendering performance (White)
• Nether Wart can now grow in the Overworld and The End