Add reset diff block, add new retarget system for fix stucked blockchain
Add reset diff block, add new retarget system for fix stucked blockchain

Add reset diff at block 3339 , and new retarget systen named DarkGravityWave from dash coin.

After 3338 block old wallet cannot sync. Update is necessary.

 This is what you wait so long, fix for stucked blockchain.

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