Ticket 28: when enabling duplicate filtering on a feed, do it retroactively

When duplicate checking is enabled on a feed, we should check all unread articles for duplicates straight away and remove them.

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Type:	new		Version:
Status:	new		Created:	2005-Dec-24 13:11
Severity:	2		Last Change:	2005-Dec-24 13:11
Priority:	2		Subsystem:
Assigned To:	majid		Derived From:
Creator:	majid