Update networks.py for digibyte v2.0

Updated Subsidy_Function to reflect new reward scheme.
For Every 10080 Blocks after the 67200th Block: the Reward is reduced by 0.5%

p2pool/bitcoin/networks.py

@@ -917,7 +917,7 @@ def check_genesis_block(bitcoind, genesis_block_hash):
             'digibyteaddress' in (yield bitcoind.rpc_help()) and
             not (yield bitcoind.rpc_getinfo())['testnet']
         )),
-        SUBSIDY_FUNC=lambda height: 8000*100000000 >> (height + 1)//1051200,
+        SUBSIDY_FUNC=lambda height: 8000*100000000,
         POW_FUNC=lambda data: pack.IntType(256).unpack(__import__('ltc_scrypt').getPoWHash(data)),
         BLOCK_PERIOD=60, # s
         SYMBOL='DGB',