#10 remove NotImplemented for final attribute on type definitions

[Peter A. Bigot]

Unless something really has to be done in the bindings, make this a warning, informational, or just get rid of it.

[Peter A. Bigot]

• status changed from new to closed
• resolution set to fixed
• milestone set to PyXB 0.5.0

Converted block and final attributes as required for STD, ED, and CTD. The values are recorded as a bit mask in the schema component objects, but are not used in the bindings.