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- There are now three states: Pending, Approved, Disapproved. You can this
way show all pending users. You can only approve or disapprove users, you
can not make them pending once they have been approved or disapproved.
- Having an approval link in the tabs confused the users, so I removed it.
- Added a "Disapprove & Delete" button at the request from users.
- Changed user_approved to user_approved for consistency.