Merge branch 'more_operator_checks' into 'NIFTy_5'

Add more automatic checks for operators

See merge request !368
11 jobs for NIFTy_5 in 8 minutes and 22 seconds (queued for 1 second)
Status Job ID Name Coverage
  Build Docker
passed #962517
build_docker_from_cache

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  Test
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test_mpi

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test_serial

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82.0%
 
  Release
passed #962520
pages

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  Demo Runs
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run_bernoulli

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run_curve_fitting

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run_getting_started_1

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run_getting_started_2

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passed #962524
run_getting_started_3

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passed #962521
run_ipynb

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  Deploy
passed pages:deploy

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