Imio-history

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- Nothing changed yet.

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- Add Transifex.net service integration to manage the translation process.
[macagua]
- Add Spanish translation
[macagua]

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- Changed default to `False` for parameters `checkMayViewEvent=False` and
`checkMayViewComment=False` of `utils.getLastAction`, this way, we get last
action even if current user may not, and it is quicker.
This fix a performance issue in `ImioWfHistoryAdapter.historyLastEventHasComments`
when called several times.
[gbastien]
- In `utils.getLastAction`, parameter `action` may be `before_last` and will
return the before last action if it exists.
[gbastien]

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- Added helper `utils.get_all_history_attr` to get every occurence of a given
`attr_name` in a `history`. This will return every `review_state` from the
`workflow` history for example.
[gbastien]

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- Added parameters `checkMayViewEvent=False` and `checkMayViewComment=False` to
`utils.getLastWFAction`, this way, we get last WF action even if current user
may not, and it is quicker.
[gbastien]

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- Allow access to module `utils` from restricted python (TAL expression).
[gbastien]