Make JPK files containing data in physical units convertable to sdf-force
When JPK files get converted with JPK software, it's possible they are saved with data already converted into physical units, instead of keeping the raw data and conversion parameters (as in raw JPK files). I think it's safe to assume if those conversion parameters are not present, the data has been correctly converted via JPK software. I propose we now use linear encoder parameters multiplier = 1, offset = 0 if no encoder parameters present, and allow conversion of the file to sdf-force.