Fix minor things

Based on https://terminology.hl7.org/5.0.0/CodeSystem-v3-ActCode.html some minor errors have been detected when converting between the formats.

• Reading of contact without telecom fails when reading .1.propcsv.xlsx
• Reading of concept properties fails in case of Coding when reading .1.propcsv.xlsx - has been resolved in !42 (merged)
• Use of hierarchyMeaning is wrong in several formats
• Reading of description results in wrong conversion if it contains 
 when reading .4.fhir.xml