Collective.contact.plonegroup

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- Fixed `addOrModifyOrganizationGroups` called when an organization is modified,
that was creating Plone groups for every suffixes without considering
`enabled` or `fct_orgs`. Added upgrade step to `v8` that will delete Plone
groups that were wrongly created.
[gbastien]

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- Fixed `settings.detectContactPlonegroupChange` where sometimes `event.oldValue`
is None when value is set several times from different testing layers.
[gbastien]

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- Do not grok the package anymore.
[gbastien]
- Override vocabulary `PositionTypes` from `collective.contact.core`, when
`context` out of a directory, get `position_types` from `DEFAULT_DIRECTORY_ID`.
[gbastien]

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- Fixed `DisplayGroupUsersView.group_title` when `DisplayGroupUsersView.short=True`
to only apply if we have a format like `My config (My suffix)` or it removed
last letter.
[gbastien]
- Added parameter `PloneGroupUsersGroupsColumn.short=True` so
`display-group-users` is rendered short by default.
[gbastien]

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- Combined v6 and v7 upgrade because it fails coming from v5
[sgeulette]
- Corrected table class name.
[sgeulette]

-----------------

- Added manage-own-groups-users view and functions/groups selection configuration.
A user can manage the user assignments of his groups.
[sgeulette]
- Avoid getting groups (only users) in `get_selected_org_suffix_users` function.
[sgeulette]
- Avoid GroupNotFoundError in `get_selected_org_suffix_users` if suffix is limited to some organizations.
[sgeulette]
- Added `BaseOrganizationServicesVocabulary._term_value` and
`BaseOrganizationServicesVocabulary._term_token` to ease override
of rendered term value and token.
[gbastien]
- Make `SelectedOrganizationsElephantVocabulary` inherits from
`OwnOrganizationServicesVocabulary` so methods `_term_value` and
`_term_token` are available.
[gbastien]
- In `display-group-users` instead displaying contained groups without
contained members, display members of contained groups for normal users,
display contained groups and contained members to Managers.
[gbastien]
- Fixed `ConnectionStateError` while setting `registry[FUNCTIONS_REGISTRY]`
in tests and profile is applied several times.
[gbastien]