Separated Crafting job into a worker thread.

Crafting calculation can be canceled.
Hooked up a crafting calculation launch and the confirmation GUI.

crafting/CraftingTreeProcess.java

@@ -86,8 +86,11 @@ public class CraftingTreeProcess
 		throw new RuntimeException( "Crafting Tree construction failed." );
 	}
 
-	public void request(MECraftingInventory inv, long i, BaseActionSource src) throws CraftBranchFailure
+	public void request(MECraftingInventory inv, long i, BaseActionSource src) throws CraftBranchFailure, InterruptedException
 	{
+		if ( Thread.interrupted() )
+			throw new InterruptedException();
+
 		// request and remove inputs...
 		for (Entry<CraftingTreeNode, Long> entry : nodes.entrySet())
 		{
@@ -129,4 +132,12 @@ public class CraftingTreeProcess
 		for (CraftingTreeNode pro : nodes.keySet())
 			pro.dive( job );
 	}
+
+	public void setSimulate()
+	{
+		crafts = 0;
+
+		for (CraftingTreeNode pro : nodes.keySet())
+			pro.setSimulate();
+	}
 }