Collective.contact.core

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- Do not execute integrity check for content types that are not related to this package.
This prevent issues with plone.app.iterate.
[mpeeters]

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- Avoid an error when we try to remove a working copy from plone.app.iterate
[mpeeters]
- Display `description` on the organization view. Field `description` may be
filled but was not displayed.
[gbastien]

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- Removed overlay on heldposition actions in person view.
[sgeulette]
- Added option to display belowcontenttitle viewlet on contact views.
[sgeulette]

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- Ensure than export is unicode encoding.
[boulch]

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- Added contact_source metadata to be used in contact widget.
[sgeulette]
- If person details privacy is True, contact details on person don't search related items.
[sgeulette]

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- Set `cacheable="True"` for `style.css` in `cssregistry.xml`.
[gbastien]
- Keep div and CSS id `viewlet-below-content-body` when rendering
`plone.belowcontentbody` viewlets on various views.
[gbastien]
- Extended `utils.get_gender_and_number` to manage parameters `use_by` and
`use_to` that will add new values to returned result prepended by
`'B'` or `'T'`.
[gbastien]
- Added email index
[sgeulette, daggelpop]