deserializing a SerializedObject should pass on deserialization errors

In HibernateSerializedObjectDAO.convertSerializedObject there's a "catch (Exception e)" that consumes the exception, instead throwing a generic "Unable to deserialize" exception that doesn't let you see what happened.

We should make sure that the DAOException we throw wraps the actual underlying exception.

As a particular special-case, I think that if the underlying exception is an APIAuthenticationException, we should throw that one directly, rather than wrapping it.