Improved microbenchmarking with multiple features.

* inline performance critical code
* Average runtime is specified and used to calculate iterations.
* Console: show median of multiple runs
* plot: show box plot
* filter benchmarks
* specify scaling factor
* ignore src/test and src/bench in command line check script
* number of iterations instead of time
* Replaced runtime in BENCHMARK makro number of iterations.
* Added -? to bench_bitcoin
* Benchmark plotly.js URL, width, height can be customized
* Fixed incorrect precision warning

src/bench/checkqueue.cpp

@@ -99,5 +99,5 @@ static void CCheckQueueSpeedPrevectorJob(benchmark::State& state)
     tg.interrupt_all();
     tg.join_all();
 }
-BENCHMARK(CCheckQueueSpeed);
-BENCHMARK(CCheckQueueSpeedPrevectorJob);
+BENCHMARK(CCheckQueueSpeed, 29000);
+BENCHMARK(CCheckQueueSpeedPrevectorJob, 1400);