MOVEONLY: Move void UpdateTime() from pow.o to miner.o (plus fix include main.h -> chain.h)
CBlockIndex::GetBlockWork() + GetProofIncrement(nBits) -> GetBlockProof(CBlockIndex)
Merge pull request #5170

092b58d CBlockIndex::GetBlockWork() + GetProofIncrement(nBits) -> GetBlockProof(CBlockIndex) (jtimon)
22c4272 MOVEONLY: Move void UpdateTime() from pow.o to miner.o (plus fix include main.h -> chain.h) (jtimon)