Collective-eeafaceted-batchactions

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- Checked permission on context (in ContactBaseBatchActionForm).
[sgeulette]

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- Highlight message about number of elements that will be updated
by the action on the popup.
[gbastien]

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- Adapted code to be able to display several tables on same page
(and so several batchactions viewlets):

- Added possibility to define the name of the `CheckBoxColumn`
(still `select_item` by default);
- Introduce idea of section for the viewlet and the batch actions so it is
possible to display different actions on different viewlets or different
views of same context.

[gbastien]
- Added method `BaseBatchActionForm._final_update` called when every other
`update` methods have been called.
[gbastien]
- Added `BaseBatchActionForm.apply_button_title` attribute to formalize
management of `apply` button title, that will be `Apply` by default but that
may be changed to fit the current batch action.
[gbastien]
- Added `DeleteBatchActionForm` a delete elements batch action.
[gbastien]
- Require `plone.formwidget.masterselect<2.0.0` as it is only for `Plone5.2+/Py3`.
[gbastien]

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- After action applied, do not reload the entire page,
just reload the current faceted results.
[gbastien]
- Use `CheckBoxFieldWidget` instead `SelectFieldWidget` to manage labels to
(un)select in `LabelsBatchActionForm` to avoid manipulation with
`CTRL+click` for selection. Adapted and rationalized translations.
[gbastien]
- Add a `collective.fingerpointing` entry when applying action to know
which action was applied on how much elements.
[gbastien]

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- Make sure elements are treated in received `uids` order. Need to rely on
`imio.helpers` to use `content.uuidsToCatalogBrains(ordered=True)`.
[gbastien]

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- Added view to change labels. (button is not added)
[sgeulette]
- Added base view to change a collective.contact.widget field.
[sgeulette]