Tuned up difficulty constant for comfortable use with new algo.

Mined new origin block to start over test network.

src/blockchain/hash_utils.rs

@@ -60,4 +60,4 @@ pub fn hash_is_good(hash: &[u8], difficulty: usize) -> bool {
     let hash_int = BigUint::from_bytes_be(&hash);
 
     return hash_int < target;
-}
+}