Merge branch 'sample_list_improvements' into 'NIFTy_8'

SampleList improvements

See merge request !696
15 jobs for NIFTy_8 in 30 minutes and 45 seconds (queued for 6 seconds)
Status Name Job ID Coverage
  Static Checks
passed check_no_asserts #1430166

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  Build Docker
passed build_docker_from_scratch #1430168

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  Test
passed test_mpi #1430172

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passed test_serial #1430170

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  Demo Runs
passed run_bernoulli #1430189

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passed run_curve_fitting #1430191

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passed run_getting_density #1430186

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passed run_getting_started_1 #1430178

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passed run_getting_started_2 #1430180

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passed run_getting_started_3 #1430182

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passed run_getting_started_mf #1430184

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passed run_ipynb0 #1430174

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passed run_ipynb1 #1430176

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passed run_meanfield #1430195

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passed run_visual_vi #1430193

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