Merge branch 'do_cleanup' into 'NIFTy_6'

Remove standard MPI parallelization

See merge request !387
8 jobs for NIFTy_6 in 8 minutes and 17 seconds (queued for 2 seconds)
Status Job ID Name Coverage
  Build Docker
passed #979833
build_docker_from_cache

00:00:18

 
  Test
passed #979834
test_serial

00:06:18

83.0%
 
  Demo Runs
passed #979839
run_bernoulli

00:00:32

passed #979840
run_curve_fitting

00:00:30

passed #979836
run_getting_started_1

00:00:36

passed #979837
run_getting_started_2

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passed #979838
run_getting_started_3

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passed #979835
run_ipynb

00:01:28