Implemented findIdByRealName.
Returned -1 instead of throwing an exception in the UserDAOImpl.create method. Added a use case for the findIdByRealName method.
Implemented voteDAO.isActive.
isActive now throws an DataAccessException when no record is found.
Removed unecessary use cases. Implemented VoteDAO.switchStatus.
Changed the isCreator method for findCreatorIdById.