Collective-iconifiedcategory

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- Generate a CSS class on the `<ul>` tag of the `categorized-childs-infos` view
that is the AJAX view called when hovering the `categorized-childs` elements
that will give the ability to display the infos on several columns. This is
necessary when displaying a large amount of categorized elements using same
content_category. The `Maximum number of elements to display by columns
when displaying categorized elements of same category in the tooltipster widget`
can be defined in the iconifiedcategory control panel.
[gbastien]
- Moved registry parameter `filesizelimit` to the IIconifiedCategorySettings.
[gbastien]
- Added a way to defer call to `utils.update_all_categorized_elements` in the
`categorized_content_container_cloned` IObjectClonedEvent event handler.
[gbastien]

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- Makes `collective-iconifiedcategory.css` cacheable and cookable to avoid
recomputing it for every pages. We call `portal_css.cookResources` when
a category is added or moved. Not necessary to recook for subcategory
as it uses same CSS class as parent category.
[gbastien]

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- Do not fail in `utils.get_categorized_elements` if context does not have the
`categorized_elements` OrderedDict.
[gbastien]

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- Use a batchSize of 999 in the tabview to show every categorized elements.
[gbastien]
- In `utils.get_categorized_elements`, do not do the catalog query if the
categorized_elements dict is empty.
[gbastien]

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- Only check `can_view` if current element is `confidential`, moreover only
instanciate the `IIconifiedContent` adapter to check for `can_view` when
element is `confidential`.
[gbastien]

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

- Adapted CSS selector that changes `font-size` of number of categorized
elements displayed in the tooltipster
[gbastien]
- Added a way to defer the categorized_content_created event and to defer
call to utils.update_categorized_elements in the categorized_content_updated
event. This way we may manage adding several categorized elements but only
updating the categorized_elements dict (including time consuming sorting)
at the right time
[gbastien]
- Fixed tests to work in both Plone 4.3.7 and Plone 4.3.11
[gbastien]