Merge branch 'density_estimator_sugar' into 'NIFTy_7'

Density estimator sugar

See merge request !620
14 jobs for NIFTy_7 in 14 minutes and 18 seconds (queued for 4 seconds)
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  Static Checks
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  Build Docker
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  Test
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passed test_serial #1330931

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  Demo Runs
passed run_bernoulli #1330940

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passed run_curve_fitting #1330941

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passed run_getting_density #1330939

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passed run_ipynb0 #1330933

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passed run_visual_mgvi #1330942

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