Collective.dms.mailcontent

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- Set original_mail_date as not required. [sgeulette]

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- Give access to configlet to Site Administrator [sgeulette].
- Renamed 'in_reply_to' field to avoid child index interference with plone.app.discussion [sgeulette]
- Updated buildout [sgeulette]
- Avoid None in internal_reference_number index. ZCatalog 3 compatibility. [sgeulette]
- Set original_mail_date as required. Added default value [sgeulette]

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- Use current datetime as encoding datetime [sgeulette]

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- Added internal reference number in Title and in SearchableText [sgeulette]

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- Corrected bad index name [sgeulette]

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- Removed Member from add permission. Must be the default. [sgeulette]