Bug mapping found in problem diagnosis and qualifier

  - name: "bodySite"
    with:
      fhir: "$resource.bodySite"
      openehr: "$archetype/data[at0012]"

Should be data.

Also correct the status mapping in qualifier. 
 https://discourse.openehr.org/t/degree-of-certainty-vs-status-in-problem-diagnosis/11561/15