Merge branch 'feature/entity_hierarchic_iterator' into 'master'

Feature/entity hierarchic iterator

See merge request !3
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Status Job ID Name Coverage
  Build
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00:01:09

 
  Test
skipped #7282
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code_quality
skipped #7281
test
 
Name Stage Failure
failed
build Build There has been a runner system failure, please try again
- duneci/*
- docker.io/duneci/*
- mathiwr/*
- registry.dune-project.org/docker/ci/*

Please check runner's configuration: http://doc.gitlab.com/ci/docker/using_docker_images.html#overwrite-image-and-services
ERROR: Preparation failed: invalid image
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ERROR: Job failed (system failure): invalid image