TST: new integration test based on a simple use case that was used for a presentation

integrationtests/test_use_case_simple_presentation.py

integrationtests/use_case_simple_presentation/cfood.yml

..._case_simple_presentation/extroot/DataAnalysis/results.md

...case_simple_presentation/extroot/ExperimentalData/data.md

...ationtests/use_case_simple_presentation/identifiables.yml

integrationtests/use_case_simple_presentation/model.yml