importer markerID
import of file that sets size of person according to its ID inside petrack (not code or marker ID)
--> import of file that sets markerID of person according to his/her personID insode petrack
- create button "import markerID"
- import and process file including personID and markerID
- make accessible via terminal input argument (?)
- write (and read) filename to pet-file (?)