message: add duration to output
diff: @@ -231,7 +231,7 @@ struct controller_impl {
  std::cerr<< "\n";
  ilog( "${n} reversible blocks replayed", ("n",rev) );
  auto end = fc::time_point::now();
  - ilog( "replayed ${n} blocks in seconds, ${mspb} ms/block",
  + ilog( "replayed ${n} blocks in ${duration} seconds, ${mspb} ms/block",
  ("n", head->block_num)("duration", (end-start).count()/1000000)
  ("mspb", ((end-start).count()/1000.0)/head->block_num) );
  std::cerr<< "\n";
  