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Make backgrounds deterministic

Andrew Gozzard requested to merge andrewmichael.gozzard/spiir:agozzard_determinism into spiir-O4-EW-development
  • atomicAdd performs arithmetic operations in a nondeterministic order, and hence produces nondeterministic values when working with floating point types.
  • Whitening uses FFTW configured with FFTW_MEASURE, which uses runtime performance to pick an FFT plan, and hence is not deterministic, so we instead use the deterministic FFTW_ESTIMATE
  • postcoh_finalsink.py assumes os.listdir() to return files in lexicographic order, which is not guaranteed, so we sort it to make this assumption hold
Edited by Andrew Gozzard

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