Merged chap_fondements_cubicweb and chap_bases_framework_cubicweb as they were both describing differents aspects of CubicWeb framework.
Replaced original content of mise_en_place_environemment that was by mistake erased and replaced with chap_migration content.
"""hooks for config2
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"""
HOOKS = {"after_delete_relation" : {"todo_by" : [lambda: 1]}}