Merge branch 'PowerGrid' into 'NIFTy_5'

Power grid

See merge request !327
10 jobs for NIFTy_5 in 1 minute and 45 seconds (queued for 2 seconds)
Status Job ID Name Coverage
  Build Docker
passed #866052
build_docker_from_cache

00:00:14

 
  Test
canceled #866054
test_mpi

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canceled #866053
test_serial

00:01:31

 
  Release
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pages

 
  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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run_getting_started_3

canceled #866056
run_ipynb