mp3 working for h2o, but inaccurate due to misplaced random grid #1703

Job	Run time
macos-latest: clang++ Release Threads	27m 34s
macos-latest: clang++ Release OneTBB	3m 17s
macos-latest: clang++ Release PaRSEC	5m 6s
ubuntu-20.04: /usr/bin/g++-9 Release Threads	35m 28s
ubuntu-20.04: /usr/bin/g++-9 Release OneTBB	1m 46s
ubuntu-20.04: /usr/bin/g++-9 Release PaRSEC	1m 44s
macos-latest: clang++ Debug Threads	43m 24s
macos-latest: clang++ Debug OneTBB	2m 50s
macos-latest: clang++ Debug PaRSEC	3m 45s
ubuntu-20.04: /usr/bin/g++-9 Debug Threads	43m 18s
ubuntu-20.04: /usr/bin/g++-9 Debug OneTBB	1m 38s
ubuntu-20.04: /usr/bin/g++-9 Debug PaRSEC	1m 33s
	2h 51m 23s

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