debinstall #8166 add a process to ensure directory/files permissions [deprecated]

Write the documentation about:

  • the group capabilities
  • the permissions on directory and files
  • check owner and group before any action
  • check if owner have group permission
  • add owner config in debinstall ($USER by default) ?

And add simple tests (for now) to check this policy and try to manage files in an atomic way (i.e. changes file)

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