Merge branch 'dev' into f-children-filter

CHANGELOG.md

Makefile

integrationtests/test_realworld_example.py

integrationtests/test_use_case_simple_presentation.py

setup.cfg

src/caoscrawler/converters.py

src/caoscrawler/crawl.py

src/caoscrawler/structure_elements.py

tox.ini

...rectories/example_substitutions/substitutions_parents.yml

unittests/test_validation.py

unittests/test_variable_substitutions.py