[R4R]add gas limit check in parlia implement #10
Merged
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Currently clique and parlia do not check the gas-limit and gas-used, it may cause security issue.
However, because of the system transactions, the gas-used of parlia implement may exceed the gas-limit, so we reserve about 100000 gas for system transactions. For now system transaction cost 22,748+ 1,516 + 24,439 = 48703 gas at most. resolve issue #9