Merge branch 'spectra_partial_merge' into 'NIFTy_5'

uncontroversial changes from operator_spectra

See merge request !345
11 jobs for NIFTy_5 in 10 minutes and 30 seconds (queued for 3 seconds)
Status Name Job ID Coverage
  Build Docker
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  Test
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passed test_serial #933394

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  Release
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  Demo Runs
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passed run_getting_started_2 #933399

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passed run_getting_started_3 #933400

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passed run_ipynb #933397

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  Deploy
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