Hl.plone.boardnotifications

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- do not try to send notification e-mail if destination address is not available (rafaelbco)
- use an OOBTree for storing subscriptions

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- fix event handler (move subscriptions)

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- when a thread is moved to another forum, move the subscriptions as well
- notify subscribers when a thread is moved

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- Make sure commenttext is unicode (jean)
- Make it not fail when deleting the PloneSite (rafaelbco)

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- meaningful viewlet names