Fix stale blockchain #1
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With high minging difficulty attack, the chain is stale for hours. To prevent halve difficulty in every 50 minutes in stale chain. Also make timespan to use 2 blocks correctly.
Make sure getblocktemplate to use new diff when it's halved on stale block. Also correct arithematic error to determine halving diff.
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As I proposed in the bitcointalk, this is more tested version to halve difficulty if the blockchain is stuck more than 50 minutes.