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)
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  Build Docker
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  Test
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passed test_serial #726597

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  Demo Runs
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passed run_curve_fitting #726604

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passed run_getting_started_1 #726600

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passed run_getting_started_2 #726601

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passed run_getting_started_3 #726602

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passed run_ipynb #726599

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