Imio.history

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- Adapted History word highlighting ti display it bigger and underline it so
it is even more viewable.
[gbastien]

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- In ImioWfHistoryAdapter.historyLastEventHasComments, call
ImioWfHistoryAdapter.getHistory with parameter 'for_last_event=True' so
getHistory knows that it queries only relevant last event and when overrided,
the package overriding it may avoid heavy processing if relevant.
[gbastien]
- Get rid of unittest2.
[gbastien]

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- Do not break in IHContentHistoryView.getTransitionTitle if transitionName
contains special characters.
[gbastien]

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- Make sure comments is displayed correctly by using portal_transforms to
turn it to 'text/html' before displaying it in the PageTemplate using
'structure'.
[gbastien]

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- Remove revision columns when unused.
[DieKatze]
- In ImioRevisionHistoryAdapter.getHistory, take into account the
'checkMayView' parameter by implementing a 'mayViewRevision' method so it
is possible to restrict access to a specific revision if necessary
[gbastien]

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- Added history-version-preview view that is called by default in the
content_history but that renders nothing. It is made to be registered for a
relevant content_type so it is possible to display a preview of a versioned
object directly in the history popup
[gbastien]