Make sure all sets in a superset have the same amount of repetitions
Make sure all sets in a superset have the same amount of repetitions

Otherwise it doesn't make sense, this fixes #54

petervanderdoes/wger,DeveloperMal/wger,petervanderdoes/wger,petervanderdoes/wger,kjagoo/wger_stark,wger-project/wger,rolandgeider/wger,kjagoo/wger_stark,petervanderdoes/wger,rolandgeider/wger,rolandgeider/wger,DeveloperMal/wger,rolandgeider/wger,DeveloperMal/wger,kjagoo/wger_stark,kjagoo/wger_stark,DeveloperMal/wger,wger-project/wger,wger-project/wger,wger-project/wger