Merge branch 'total_volume' into 'NIFTy_5'

Add total_volume property to DomainTuple

See merge request !359
11 jobs for NIFTy_5 in 19 minutes and 29 seconds (queued for 2 seconds)
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  Build Docker
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build_docker_from_scratch

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  Test
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test_mpi

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test_serial

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  Release
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pages

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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_ipynb

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  Deploy
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