Collective-iconifiedcategory

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- Added `many_elements_7_columns` and `many_elements_8_columns` styles necessary
when displaying really many elements on several columns.
[gbastien]
- Make sure the icon sticks to the text first word in the tooltipster popup
by wrapping the icon and categorized element title first word in a `<span>`
that uses a `style="white-space: nowrap"`.
[gbastien]

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- Fix CSS applied in tooltipster popup for active confidential.
[gbastien]

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- Make sure number of elements applied CSS is done when tooltipstered or not.
[gbastien]
- Added possibility to pass a CSS selector to `categorizedChildsInfos`, the JS
method that initialize `tooltipster` for categorized elements.
[gbastien]

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- Adapted JS call to `tooltipster` as `collective.js.tooltipster` now uses
`tooltipster` 4.2.6. Require `collective.js.tooltipster` > 0.1
[gbastien]

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- When changing an element's `content_category`, reapply the default values for
fields `to_print`, `confidential`, `to_sign` and `signed` if it was still the
original default value defined on original `content_category`. Default values
are linked to the `content_category`.
[gbastien]

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- In `actionview.BaseView`, moved the `ObjectModifiedEvent` from the `__call__`
to the `set_values` method so using it directly updates the
`categorized_elements` of the parent.
[gbastien]