Update RadiologyOrderFormController and its tests
* autowire RadiologyOrderValidator
* udpate javadocs to match module conventions
* remove context.isAuthenticated checks, this is done in the jsps
* remove unnecessary ModelAttribute names if same as default
* remove unnecessary RequestParam required=true since its default
* remove unnecessary parameters for saveRadiologyOrder POST method
* rename methods, remove duplicate info from their names. POST is known via
RequestMapping
* remove javax.validation annotations in DiscontinueOrderRequest since we use
Validator
