Collective.documentgenerator

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- Mailing: include context variables from original template in mailing generation context.
[sgeulette]
- pep8: sort import
[sgeulette]

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- On a POD template, added possibility to reuse the `odt_file` of another
POD template.
[anuyens, odelaere, gbastien]
- Do not register the `batchactions` viewlet displayed in the
`IBelowContentBody` viewlet using the `IBatchActionsMarker` but register it
for a more specific interface `IBelowContentBodyBatchActionsMarker`.
[gbastien]
- Override batch actions viewlet available method.
[sgeulette]
- Added Column modifier management (new in appy > 0.9.11)
[odelaere]

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- Update renderer parameters: managePageStyles and resolveFields.
[sgeulette]
- Removed rename_page_styles field from pod template schema.
[sgeulette]

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- Add hook to provides all helper view to be updated with
appy renderer
[sdelcourt]

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- Use `edit_action_target` in view action column.
[sgeulette]
- Do not use CSS to manage contenttype icon,
we have an icon_epxr on the portal_types.
[gbastien]
- Use collective.eeafaceted.batchactions, if present.
Add a selection column and a batch transition button
[sgeulette]
- Use portal type icon to display in table view.
[sgeulette]

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- Added rename_page_styles field and used it as renderer parameter.
[sgeulette]
- Added plone translations.
[sgeulette]