Merge branch 'backports' into 'NIFTy_7'

Backports nifty8 -> nifty7

See merge request !663
18 jobs for NIFTy_7 in 30 minutes and 42 seconds (queued for 8 seconds)
Status Job ID Name Coverage
  Static Checks
passed #1364797
check_no_asserts

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  Build Docker
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build_docker_from_scratch

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  Test
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test_mpi

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passed #1364808
test_serial

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  Release
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pages

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  Demo Runs
passed #1364853
run_bernoulli

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run_curve_fitting

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run_getting_density

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run_getting_started_1

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run_getting_started_2

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run_getting_started_3

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passed #1364849
run_getting_started_mf

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passed #1364830
run_ipynb0

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run_ipynb1

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passed #1364859
run_meanfield

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passed #1364861
run_nonlinearity_guide

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passed #1364856
run_visual_vi

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  Deploy
passed pages:deploy

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