Collective.contact.plonegroup

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

- In `OrgaPrettyLinkWithAdditionalInfosColumn`, set `showContentIcon` to True
and enable `link-tooltip`.
[gbastien]
- In `SelectedInPlonegroupColumn`, display `Not` in bold.
[gbastien]
- Added `collective.contact.plonegroup.functions` vocabulary listing every
functions defined in plonegroup control panel.
[gbastien]

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

- Corrected bad full title shortening.
[sgeulette]

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

- Fixed error in `OrgaPrettyLinkWithAdditionalInfosColumn` when displaying
organizations out of `PLONEGROUP_ORG`.
[gbastien]
- Fixed `utils.get_organizations` when `caching=True` to store a new list of
organizations in the cache instead returned value or value in cache may be
modified if we modify returned value in a sub method...
[gbastien]
- Use `get_registry_organizations/set_registry_organizations` and
`get_registry_functions/set_registry_functions` as much as possible.
[gbastien]

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

- Fixed problem, linked Plone groups title were not updated when suffix title
changed and some `fct_orgs` were defined.
[gbastien]
- In `settings.detectContactPlonegroupChange`, set `changes = True` only when
relevant, due to wrong indentation, it was done systematically.
[gbastien]

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

- Make `OrgaPrettyLinkWithAdditionalInfosColumn` work if displaying the
`plonegroup-organization`, include link to plonegroup configuration panel in
`SelectedInPlonegroupColumn` header.
[gbastien]
- Changed first parameter name for `utils.get_plone_group` and
`utils.get_plone_group_id` from `org_uid` to `prefix` as it can be used in
other cases.
[gbastien]
- Added helper method `utils.select_org_for_function` to be able to add/remove
an organization uid from `fct_orgs` defined on a `function`.
[gbastien]
- Removed dependency on `unittest2`.
[gbastien]
- When calling `config.get_registry_organizations` and
`config.get_registry_functions`, by default return a copy of stored data to
avoid changing it.
[gbastien]
- Added parameter `default=True` to `utils.get_own_organization`, in this case,
default ids for `root directory` and `own organization` are used instead
using a catalog query, it should be faster.
[gbastien]

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

- Use unrestrictedSearchResults to check link integrity.
[sgeulette]
- Added helpers config.get_registry_organizations,
config.get_registry_functions, config.set_registry_organizations and
config.set_registry_functions to easily get and set organizations/functions
registry records.
[gbastien]