RAD-166 Add RadiologyOrder.isCompleted()
* add tests for Study.isCompleted()
* add RadiologyOrder.isCompleted()
* add RadiologyOrder.isNotCompleted
* replace use of ! Study.isCompleted() in
RadiologyServiceImpl.createAndClaimRadiologyReport() by
RadiologyOrder.isNotCompleted()
* add missing tests for radiologyReportNeedsToBeCreated in RadiologyOrderFormControllerTest
* simplify radiologyReportNeedsToBeCreated