add more graphviz engine capabilities. add cmd if graphviz is installed, and graalvm (javascript engine)

better ui for button in StatusBox

See merge request !4

Resolve "supprimer un des emplacements parents"

Closes #8

See merge request !3

Merge branch '12-pb-affichage-contenu-tableau-d-observation-si-nombreux-tableaux-pour-une-observation' into 'develop'

Draft: Resolve "Pb affichage contenu tableau d'observation si nombreux tableaux pour une observation"

Closes #12

See merge request !2

Merge branch '19-supression-des-lors-de-l-export-d-une-ontologie-pour-les-cellules-vides' into 'develop'

Resolve "Supression des " lors de l'export d'une ontologie pour les cellules vides"

Closes #19

See merge request !1

Merge branch 'develop' into 19-supression-des-lors-de-l-export-d-une-ontologie-pour-les-cellules-vides

done

update PO²Engine (bug exact/close match on import)

bug fix on windows & mac for the graph visualisation. Force to add a missing (win & mac) dependency (because of the build env :: linux)

done