Merge branch 'mpi_scheme_by_environment' into 'NIFTy_5'

Set MPI parallelization scheme by environment variable

See merge request !380
10 jobs for NIFTy_5 in 9 minutes and 41 seconds (queued for 2 seconds)
Status Name Job ID Coverage
  Build Docker
failed build_docker_from_scratch #1082191

00:09:41

 
  Test
skipped test_mpi #1082193
skipped test_serial #1082192
 
  Release
skipped pages #1082194
 
  Demo Runs
skipped run_bernoulli #1082199
skipped run_curve_fitting #1082200
skipped run_getting_started_1 #1082196
skipped run_getting_started_2 #1082197
skipped run_getting_started_3 #1082198
skipped run_ipynb #1082195
 
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failed
build_docker_from_scratch Build Docker
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