Store verified status in database

All verified reviews where bing overwritten in the database due to
 how the Review object is structured. This inserts the review row
 and updates the verified/code-review status independently.
Reviewer: Store label as enum
Details adapter: Refresh visible views when cursor changes;
 fix possible NPE from invalid cursor.

Change-Id: Ia1423cb429509042677064b31c335da43a22bc31