Collective-emailconfirmationregistration

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- fix notification issue

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- plone 5 support

- send email to admins warning them they need to review request

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- Send email to user that doesn't need to reset their password that they have
been approved.
[vangheem]

- Added button to enable request review.
[maurits]

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- fix upgrade
[vangheem]

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- be able to review registration requests before
a user is created on the site

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- handle no email being set