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Conclusive demonstration of the root cause behind obscenely slow
block verification on machines equipped with mechanical HDD.

This patch supercedes
http://therealbitcoin.org/ml/btc-dev/2017-February/000254.html .

Each call to ProcessBlock() is timed, and the time (in mSec) is
logged at the conclusion of said call, along with the sub-interval
spent waiting for DB writes.

You will see, e.g.,

SetBestChain: new best=00000000000000000070  height=454665  work=79327460642482930250923112
ProcessBlock: ACCEPTED
ProcessBlock (res == 1) took : 99217ms; db write wait: 81761ms
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