Imio.history

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- Nothing changed yet.

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- Added `utils.get_all_history_attr` to `safe_utils`.
[gbastien]

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- Moved translation of event comments to a sub method
`IHContentHistoryView._translate_comments` so it is easier to override.
[gbastien]

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- Adapted `utils.getPreviousEvent` to add parameter `history_name='workflow'`.
[gbastien]
- Fixed display of `HISTORY_COMMENT_NOT_VIEWABLE` in `contenthistory` view
that was displayed as text, showing the HTML code.
[gbastien]

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- Added `utils.add_event_to_wf_history` to insert an event
to the `workflow_history` of an element.
[gbastien]

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- In `IHDocumentBylineViewlet`, do not display creator if `show_history`
is `False` as creator is part of the history.
[gbastien]
- In `historyview`, display a `header` view under `History` title that will
by default display the `prettylink` of the context, useful when displaying
history in a popup from a dashboard containing plenty of elements.
Added direct dependency on `imio.prettylink`.
[gbastien]