exposed createPaperMedicalRecordFor API method in the PaperRecordService and changed it to return a PatientIdentifier (instead of a String version of the identifier)
renamed createPaperMedicalRecordNumberFor to createPaperMedicalRecordNumber
#625: When assigning a new dossier number to a patient, the paper record service should double-check to make sure that dossier number is not already in use