VIVO-118 Clean up DataPropertyDaoFiltering

Remove unused imports, add @Override tags as appropriate. Remove unused methods (don't override the interface, not called). Separate filtering methods from non-filtering methods. Cosmetic formatting.
VIVO-118 Make getDataPropertyByURI() an unfiltered operation.

This method is used to determine whether a given property is a data property or not. If the user is restricted from displaying this property, then the filtered answer is NO. But that is really inappropriate. The real questions are whether the user can see the values of this property, and whether the user can add or modify values of this property -- not whether the user can see or modify the property itself.
Merge branch 'develop' of git+ssh://github.com/vivo-project/Vitro into develop