FunctionImpl::do_apply : shell-based screening in PBC case computes d… #1990

Job	Run time
macos-latest: clang++ Release Threads	11m 45s
macos-latest: clang++ Release OneTBB	1m 31s
macos-latest: clang++ Release PaRSEC	1m 43s
ubuntu-20.04: /usr/bin/g++-9 Release Threads	36m 49s
ubuntu-20.04: /usr/bin/g++-9 Release OneTBB	2m 14s
ubuntu-20.04: /usr/bin/g++-9 Release PaRSEC	2m 21s
macos-latest: clang++ Debug Threads	17m 26s
macos-latest: clang++ Debug OneTBB	1m 58s
macos-latest: clang++ Debug PaRSEC	1m 55s
ubuntu-20.04: /usr/bin/g++-9 Debug Threads	47m 27s
ubuntu-20.04: /usr/bin/g++-9 Debug OneTBB	2m 12s
ubuntu-20.04: /usr/bin/g++-9 Debug PaRSEC	2m 6s
	2h 9m 27s

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