fix two minor bugs in parsing nlloc output and xml output

 - origin quality had min/max/medianDistance fields in meters (and not
   in degrees as should be)
 - epicentral distance for arrivals was parsed wrong from nlloc output
   and is wrong for all arrivals

these bugs are present in xml files with origin method_id
smi:de.erdbeben-in-bayern/location_method/nlloc/2. After the fix the
method_id is now smi:de.erdbeben-in-bayern/location_method/nlloc/3.