Merge branch 'fix_mpi_kl' into 'NIFTy_6'

Fix mpi kl

See merge request !453
10 jobs for NIFTy_6 in 23 minutes and 8 seconds (queued for 3 seconds)
Status Name Job ID Coverage
  Build Docker
passed build_docker_from_cache #1066893

00:00:17

 
  Test
passed test_mpi #1066895

00:00:40

passed test_serial #1066894

00:14:18

86.0%
 
  Demo Runs
passed run_bernoulli #1066901

00:00:36

passed run_curve_fitting #1066902

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passed run_getting_started_1 #1066897

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passed run_getting_started_2 #1066898

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passed run_getting_started_3 #1066899

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passed run_getting_started_mf #1066900

00:05:14

passed run_ipynb #1066896

00:01:38