Merge branch 'convolution_operator' into 'NIFTy_5'

Spherical Convolution operator

See merge request !297
11 jobs for NIFTy_5 in 21 minutes and 45 seconds (queued for 3 seconds)
Status Job ID Name Coverage
  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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  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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  Deploy
passed pages:deploy

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