Merge branch 'check_version' into 'NIFTy_5'

explicitly check Python version in setup.py

See merge request !288
9 jobs for improving_consistency_checks in 8 minutes and 5 seconds (queued for 2 seconds)
Status Job ID Name Coverage
  Build Docker
passed #726596
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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83.0%
 
  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

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run_ipynb

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