Merge pull request #187 from eschnett/eschnett/interpolate #753

Job	Run time
download-build-test (cpu, real32, debug)	12m 36s
download-build-test (cpu, real64, debug)	16m 38s
download-build-test (cpu, real64, optimize)	23m 6s
download-build-test (cuda, real32, debug)	34m 10s
download-build-test (cuda, real64, debug)	27m 48s
download-build-test (cuda, real64, optimize)	29m 25s
download-build-test (rocm, real64, debug)	21m 32s
download-build-test (rocm, real64, optimize)	19m 29s
	3h 4m 44s

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