Build

Merge pull request #340 from EricaCMitchell/emultipole_derivs #105

Job	Run time
Repo • macos-latest: clang++ Release	1m 13s
Repo • ubuntu-20.04: g++-10 Release	27m 52s
Repo • macos-latest: clang++ Debug	1m 0s
Repo • ubuntu-20.04: g++-10 Debug	22m 42s
Export • ubuntu-gnu	3m 24s
Export • windows-clang-cl	6m 33s
Export • macos-clang	8m 24s
Export • ubuntu-intel	3m 44s
	1h 14m 52s

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