add possibility to have in-chain uncles as tests
add possibility to have in-chain uncles as tests

ruchevits/solidity,debris/solidity,shahankhatch/solidity,chriseth/solidity-doc-test,vaporry/solidity,douglas-larocca/solidity,ethers/solidity,LianaHus/solidity,chriseth/solidity,arkpar/solidity,gluk256/solidity,ruchevits/solidity,ruchevits/solidity,ruchevits/solidity