Resolve "supprimer un des emplacements parents"

added 2 commits

82be304a - work on icotest instead of quantum
dd4801ce - add new menu in VocabTreeCell to remove a node from one of his parents

marked this merge request as ready

Ajout d'un nouveau menu sur un concept uniquement s'il a plusieurs parents -> remove concept from one parent

merged

mentioned in commit 58692c2c

changed milestone to %v1.6.3.0

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