Accept HL7 v2 Cancel Patient Transfer/Discharge ADT^A12/A13 message by default

[gunterze]

Accept HL7 v2 ADT Cancel messages:

• A12 – Transfer of a patient from one location to another has been cancelled due to error
  in the information or the decision not to transfer the patient.
• A13 – Discharge of a patient has been cancelled due to error in the information or the
  decision not to discharge the patient.

with default configuration in compliance with IHE Transaction RAD-12: Patient Update, specified in IHE Radiology Technical Framework, Volume 2 (RAD TF-2), Section 4.12.4.5 Patient Management – Cancel Patient Transfer/Discharge