Issue #770. The id of a Patient object should be accessible via an intuitive API function.
Added getExternalId() method to the Patient interface.
Issue #770. The id of a Patient object should be accessible via an intuitive API function.
Small fix.
Merge pull request #789 from soLEED/issue-770

Issue #770: The id of a Patient object should be accessible via an intuitive API function
Added getExternalId()