Merge branch 'fix_pip' into 'NIFTy_5'

fix installation command

See merge request !292
11 jobs for NIFTy_5 in 18 minutes and 51 seconds (queued for 1 second)
Status Name Job ID Coverage
  Build Docker
passed build_docker_from_scratch #732445

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  Test
passed test_mpi #732447

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passed test_serial #732446

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  Release
passed pages #732448

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  Demo Runs
passed run_bernoulli #732453

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passed run_curve_fitting #732454

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passed run_getting_started_1 #732450

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passed run_getting_started_2 #732451

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passed run_getting_started_3 #732452

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passed run_ipynb #732449

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  Deploy
passed pages:deploy

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