Merge branch 'multiprocessing' into 'master'

Trial to implement EM with multiprocessing

See merge request !16
3 jobs for master in 22 minutes and 7 seconds (queued for 2 seconds)
Status Job ID Name Coverage
  Build
passed #164981
docker
build_linux_36

00:19:18

91.0%
passed #164982
macosx
build_macosx_36

00:09:41

91.0%
 
  Deploy
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docker
deploy_beta

00:02:49